121307431 has 4 divisors (see below), whose sum is σ = 138637072. Its totient is φ = 103977792.

The previous prime is 121307413. The next prime is 121307437. The reversal of 121307431 is 134703121.

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 121307431 - 2²¹ = 119210279 is a prime.

It is a super-2 number, since 2×121307431² = 29430985631639522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121307437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8664810 + ... + 8664823.

It is an arithmetic number, because the mean of its divisors is an integer number (34659268).

Almost surely, 2^121307431 is an apocalyptic number.

121307431 is a deficient number, since it is larger than the sum of its proper divisors (17329641).

121307431 is an equidigital number, since it uses as much as digits as its factorization.

121307431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17329640.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 121307431 is about 11013.9652714179. The cubic root of 121307431 is about 495.0272827870.

The spelling of 121307431 in words is "one hundred twenty-one million, three hundred seven thousand, four hundred thirty-one".