121115631 has 32 divisors (see below), whose sum is σ = 207406080. Its totient is φ = 61104384.

The previous prime is 121115597. The next prime is 121115641. The reversal of 121115631 is 136511121.

It is a happy number.

It is not a de Polignac number, because 121115631 - 2⁶ = 121115567 is a prime.

It is a super-2 number, since 2×121115631² = 29337992145056322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 121115598 and 121115607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121115641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3366 + ... + 15923.

It is an arithmetic number, because the mean of its divisors is an integer number (6481440).

Almost surely, 2^121115631 is an apocalyptic number.

121115631 is a deficient number, since it is larger than the sum of its proper divisors (86290449).

121115631 is a wasteful number, since it uses less digits than its factorization.

121115631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19335.

The product of its digits is 180, while the sum is 21.

The square root of 121115631 is about 11005.2546994606. The cubic root of 121115631 is about 494.7662481685.

Adding to 121115631 its reverse (136511121), we get a palindrome (257626752).

The spelling of 121115631 in words is "one hundred twenty-one million, one hundred fifteen thousand, six hundred thirty-one".