121536431 has 4 divisors (see below), whose sum is σ = 122739864. Its totient is φ = 120333000.

The previous prime is 121536413. The next prime is 121536433. The reversal of 121536431 is 134635121.

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

It is a cyclic number.

It is not a de Polignac number, because 121536431 - 2¹⁸ = 121274287 is a prime.

It is a super-2 number, since 2×121536431² = 29542208120435522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121536431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121536433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 601565 + ... + 601766.

It is an arithmetic number, because the mean of its divisors is an integer number (30684966).

Almost surely, 2^121536431 is an apocalyptic number.

121536431 is a deficient number, since it is larger than the sum of its proper divisors (1203433).

121536431 is a wasteful number, since it uses less digits than its factorization.

121536431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203432.

The product of its digits is 2160, while the sum is 26.

The square root of 121536431 is about 11024.3562623856. The cubic root of 121536431 is about 495.3385854785.

The spelling of 121536431 in words is "one hundred twenty-one million, five hundred thirty-six thousand, four hundred thirty-one".