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2141991 = 3379333
BaseRepresentation
bin1000001010111100100111
311000211021000
420022330213
51022020431
6113524343
724130605
oct10127447
94024230
102141991
111233345
128736b3
1359cc67
143da875
152c49e6
hex20af27

2141991 has 8 divisors (see below), whose sum is σ = 3173360. Its totient is φ = 1427976.

The previous prime is 2141987. The next prime is 2142001. The reversal of 2141991 is 1991412.

2141991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2141991 - 22 = 2141987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 79333 = 2141991 / (2 + 1 + 4 + 1 + 9 + 9 + 1).

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2141941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39640 + ... + 39693.

It is an arithmetic number, because the mean of its divisors is an integer number (396670).

22141991 is an apocalyptic number.

2141991 is a deficient number, since it is larger than the sum of its proper divisors (1031369).

2141991 is an equidigital number, since it uses as much as digits as its factorization.

2141991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79342 (or 79336 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 2141991 is about 1463.5542354146. The cubic root of 2141991 is about 128.9058263457.

The spelling of 2141991 in words is "two million, one hundred forty-one thousand, nine hundred ninety-one".

Divisors: 1 3 9 27 79333 237999 713997 2141991