121235531 has 4 divisors (see below), whose sum is σ = 121870464. Its totient is φ = 120600600.

The previous prime is 121235509. The next prime is 121235549. The reversal of 121235531 is 135532121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121235531 is a prime.

It is a super-2 number, since 2×121235531² = 29396107953703922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121235497 and 121235506.

It is not an unprimeable number, because it can be changed into a prime (121235591) 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, 317180 + ... + 317561.

It is an arithmetic number, because the mean of its divisors is an integer number (30467616).

Almost surely, 2^121235531 is an apocalyptic number.

121235531 is a deficient number, since it is larger than the sum of its proper divisors (634933).

121235531 is an equidigital number, since it uses as much as digits as its factorization.

121235531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634932.

The product of its digits is 900, while the sum is 23.

The square root of 121235531 is about 11010.7007497252. The cubic root of 121235531 is about 494.9294610909.

Adding to 121235531 its reverse (135532121), we get a palindrome (256767652).

The spelling of 121235531 in words is "one hundred twenty-one million, two hundred thirty-five thousand, five hundred thirty-one".