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121287 = 340429
BaseRepresentation
bin11101100111000111
320011101010
4131213013
512340122
62333303
71013415
oct354707
9204333
10121287
1183141
125a233
134328a
14322b5
1525e0c
hex1d9c7

121287 has 4 divisors (see below), whose sum is σ = 161720. Its totient is φ = 80856.

The previous prime is 121283. The next prime is 121291. The reversal of 121287 is 782121.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (121283) and next prime (121291).

It is not a de Polignac number, because 121287 - 22 = 121283 is a prime.

It is a D-number.

It is a Duffinian number.

121287 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 121287.

It is not an unprimeable number, because it can be changed into a prime (121283) 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 3 ways as a sum of consecutive naturals, for example, 20212 + ... + 20217.

It is an arithmetic number, because the mean of its divisors is an integer number (40430).

2121287 is an apocalyptic number.

121287 is a deficient number, since it is larger than the sum of its proper divisors (40433).

121287 is an equidigital number, since it uses as much as digits as its factorization.

121287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40432.

The product of its digits is 224, while the sum is 21.

The square root of 121287 is about 348.2628317808. The cubic root of 121287 is about 49.4999489847.

The spelling of 121287 in words is "one hundred twenty-one thousand, two hundred eighty-seven".

Divisors: 1 3 40429 121287