121615988 has 36 divisors (see below), whose sum is σ = 233117892. Its totient is φ = 55186560.

The previous prime is 121615961. The next prime is 121615993. The reversal of 121615988 is 889516121.

It can be written as a sum of positive squares in 2 ways, for example, as 25928464 + 95687524 = 5092^2 + 9782^2 .

It is a super-2 number, since 2×121615988² = 29580897074432288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233168 + ... + 233688.

It is an arithmetic number, because the mean of its divisors is an integer number (6475497).

Almost surely, 2^121615988 is an apocalyptic number.

It is an amenable number.

121615988 is a deficient number, since it is larger than the sum of its proper divisors (111501904).

121615988 is a wasteful number, since it uses less digits than its factorization.

121615988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 603 counting only the distinct ones).

The product of its digits is 34560, while the sum is 41.

The square root of 121615988 is about 11027.9639099881. The cubic root of 121615988 is about 495.4466437673.

The spelling of 121615988 in words is "one hundred twenty-one million, six hundred fifteen thousand, nine hundred eighty-eight".