891137800957 has 4 divisors (see below), whose sum is σ = 891149171680. Its totient is φ = 891126430236.

The previous prime is 891137800939. The next prime is 891137800961. The reversal of 891137800957 is 759008731198.

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.

It is a cyclic number.

It is not a de Polignac number, because 891137800957 - 2¹⁹ = 891137276669 is a prime.

It is a super-3 number, since 3×891137800957³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891137800907) 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, 5566983 + ... + 5724820.

It is an arithmetic number, because the mean of its divisors is an integer number (222787292920).

Almost surely, 2^891137800957 is an apocalyptic number.

It is an amenable number.

891137800957 is a deficient number, since it is larger than the sum of its proper divisors (11370723).

891137800957 is a wasteful number, since it uses less digits than its factorization.

891137800957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11370722.

The product of its (nonzero) digits is 3810240, while the sum is 58.

The spelling of 891137800957 in words is "eight hundred ninety-one billion, one hundred thirty-seven million, eight hundred thousand, nine hundred fifty-seven".