121500657 has 12 divisors (see below), whose sum is σ = 177723520. Its totient is φ = 79974648.

The previous prime is 121500623. The next prime is 121500661. The reversal of 121500657 is 756005121.

121500657 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 0 + 0 + 657 = 666.

It is not a de Polignac number, because 121500657 - 2¹⁴ = 121484273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121500657.

It is not an unprimeable number, because it can be changed into a prime (121500607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84733 + ... + 86154.

Almost surely, 2^121500657 is an apocalyptic number.

It is an amenable number.

121500657 is a deficient number, since it is larger than the sum of its proper divisors (56222863).

121500657 is a wasteful number, since it uses less digits than its factorization.

121500657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170972 (or 170969 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 121500657 is about 11022.7336446092. The cubic root of 121500657 is about 495.2899800759.

Adding to 121500657 its reverse (756005121), we get a palindrome (877505778).

The spelling of 121500657 in words is "one hundred twenty-one million, five hundred thousand, six hundred fifty-seven".