957121621 has 4 divisors (see below), whose sum is σ = 987996544. Its totient is φ = 926246700.

The previous prime is 957121549. The next prime is 957121631. The reversal of 957121621 is 126121759.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 126121759 = 17 ⋅7418927.

It is a cyclic number.

It is not a de Polignac number, because 957121621 - 2¹¹ = 957119573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (957121631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15437415 + ... + 15437476.

It is an arithmetic number, because the mean of its divisors is an integer number (246999136).

Almost surely, 2^957121621 is an apocalyptic number.

It is an amenable number.

957121621 is a deficient number, since it is larger than the sum of its proper divisors (30874923).

957121621 is a wasteful number, since it uses less digits than its factorization.

957121621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30874922.

The product of its digits is 7560, while the sum is 34.

The square root of 957121621 is about 30937.3822583618. The cubic root of 957121621 is about 985.4979131234.

The spelling of 957121621 in words is "nine hundred fifty-seven million, one hundred twenty-one thousand, six hundred twenty-one".