957091021 has 2 divisors, whose sum is σ = 957091022. Its totient is φ = 957091020.

The previous prime is 957090977. The next prime is 957091027. The reversal of 957091021 is 120190759.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 482461225 + 474629796 = 21965^2 + 21786^2 .

It is a cyclic number.

It is not a de Polignac number, because 957091021 - 2²¹ = 954993869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (957091027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 478545510 + 478545511.

It is an arithmetic number, because the mean of its divisors is an integer number (478545511).

Almost surely, 2^957091021 is an apocalyptic number.

It is an amenable number.

957091021 is a deficient number, since it is larger than the sum of its proper divisors (1).

957091021 is an equidigital number, since it uses as much as digits as its factorization.

957091021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 957091021 is about 30936.8877070723. The cubic root of 957091021 is about 985.4874106067.

The spelling of 957091021 in words is "nine hundred fifty-seven million, ninety-one thousand, twenty-one".