1241991 has 6 divisors (see below), whose sum is σ = 1794000. Its totient is φ = 827988.

The previous prime is 1241987. The next prime is 1242001. The reversal of 1241991 is 1991421.

It is not a de Polignac number, because 1241991 - 2² = 1241987 is a prime.

It is an Ulam number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1241921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68991 + ... + 69008.

It is an arithmetic number, because the mean of its divisors is an integer number (299000).

2^1241991 is an apocalyptic number.

1241991 is a deficient number, since it is larger than the sum of its proper divisors (552009).

1241991 is a wasteful number, since it uses less digits than its factorization.

1241991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138005 (or 138002 counting only the distinct ones).

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

The square root of 1241991 is about 1114.4464993888. The cubic root of 1241991 is about 107.4911764887.

The spelling of 1241991 in words is "one million, two hundred forty-one thousand, nine hundred ninety-one".