691454971 has 2 divisors, whose sum is σ = 691454972. Its totient is φ = 691454970.

The previous prime is 691454899. The next prime is 691454977. The reversal of 691454971 is 179454196.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 691454971 - 2⁷ = 691454843 is a prime.

It is a super-2 number, since 2×691454971² = 956219953841221682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (691454977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345727485 + 345727486.

It is an arithmetic number, because the mean of its divisors is an integer number (345727486).

Almost surely, 2^691454971 is an apocalyptic number.

691454971 is a deficient number, since it is larger than the sum of its proper divisors (1).

691454971 is an equidigital number, since it uses as much as digits as its factorization.

691454971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 691454971 is about 26295.5313884318. The cubic root of 691454971 is about 884.2762640394.

The spelling of 691454971 in words is "six hundred ninety-one million, four hundred fifty-four thousand, nine hundred seventy-one".