975632821 has 2 divisors, whose sum is σ = 975632822. Its totient is φ = 975632820.

The previous prime is 975632783. The next prime is 975632893. The reversal of 975632821 is 128236579.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 930555025 + 45077796 = 30505^2 + 6714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-975632821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (925632821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 487816410 + 487816411.

It is an arithmetic number, because the mean of its divisors is an integer number (487816411).

Almost surely, 2^975632821 is an apocalyptic number.

It is an amenable number.

975632821 is a deficient number, since it is larger than the sum of its proper divisors (1).

975632821 is an equidigital number, since it uses as much as digits as its factorization.

975632821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 975632821 is about 31235.1215941286. The cubic root of 975632821 is about 991.8107258581.

The spelling of 975632821 in words is "nine hundred seventy-five million, six hundred thirty-two thousand, eight hundred twenty-one".