121577657 has 8 divisors (see below), whose sum is σ = 126408000. Its totient is φ = 116789904.

The previous prime is 121577611. The next prime is 121577663. The reversal of 121577657 is 756775121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121577657 - 2²⁰ = 120529081 is a prime.

It is a super-2 number, since 2×121577657² = 29562253363219298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121537657) 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, 4763 + ... + 16304.

It is an arithmetic number, because the mean of its divisors is an integer number (15801000).

Almost surely, 2^121577657 is an apocalyptic number.

It is an amenable number.

121577657 is a deficient number, since it is larger than the sum of its proper divisors (4830343).

121577657 is a wasteful number, since it uses less digits than its factorization.

121577657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21295.

The product of its digits is 102900, while the sum is 41.

The square root of 121577657 is about 11026.2258728905. The cubic root of 121577657 is about 495.3945865744.

The spelling of 121577657 in words is "one hundred twenty-one million, five hundred seventy-seven thousand, six hundred fifty-seven".