121637656 has 32 divisors (see below), whose sum is σ = 261008640. Its totient is φ = 52059168.

The previous prime is 121637653. The next prime is 121637683. The reversal of 121637656 is 656736121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121637651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72135 + ... + 73801.

It is an arithmetic number, because the mean of its divisors is an integer number (8156520).

Almost surely, 2^121637656 is an apocalyptic number.

It is an amenable number.

121637656 is an abundant number, since it is smaller than the sum of its proper divisors (139370984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121637656 is a wasteful number, since it uses less digits than its factorization.

121637656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2983 (or 2979 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 121637656 is about 11028.9462778635. The cubic root of 121637656 is about 495.4760661609.

The spelling of 121637656 in words is "one hundred twenty-one million, six hundred thirty-seven thousand, six hundred fifty-six".