691792957 has 2 divisors, whose sum is σ = 691792958. Its totient is φ = 691792956.

The previous prime is 691792921. The next prime is 691792963. The reversal of 691792957 is 759297196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 369446841 + 322346116 = 19221^2 + 17954^2 .

It is a cyclic number.

It is not a de Polignac number, because 691792957 - 2²³ = 683404349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 691792898 and 691792907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691792357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345896478 + 345896479.

It is an arithmetic number, because the mean of its divisors is an integer number (345896479).

Almost surely, 2^691792957 is an apocalyptic number.

It is an amenable number.

691792957 is a deficient number, since it is larger than the sum of its proper divisors (1).

691792957 is an equidigital number, since it uses as much as digits as its factorization.

691792957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2143260, while the sum is 55.

The square root of 691792957 is about 26301.9572845825. The cubic root of 691792957 is about 884.4203198475.

The spelling of 691792957 in words is "six hundred ninety-one million, seven hundred ninety-two thousand, nine hundred fifty-seven".