975717991 has 8 divisors (see below), whose sum is σ = 981249920. Its totient is φ = 970196832.

The previous prime is 975717989. The next prime is 975718033. The reversal of 975717991 is 199717579.

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 975717991 - 2¹ = 975717989 is a prime.

It is a super-2 number, since 2×975717991² = 1904051195922152162, which contains 22 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 (975717931) 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, 236341 + ... + 240433.

It is an arithmetic number, because the mean of its divisors is an integer number (122656240).

Almost surely, 2^975717991 is an apocalyptic number.

975717991 is a deficient number, since it is larger than the sum of its proper divisors (5531929).

975717991 is a wasteful number, since it uses less digits than its factorization.

975717991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5385.

The product of its digits is 1250235, while the sum is 55.

The square root of 975717991 is about 31236.4849334876. The cubic root of 975717991 is about 991.8395857802.

The spelling of 975717991 in words is "nine hundred seventy-five million, seven hundred seventeen thousand, nine hundred ninety-one".