691274457 has 6 divisors (see below), whose sum is σ = 998507562. Its totient is φ = 460849632.

The previous prime is 691274431. The next prime is 691274471. The reversal of 691274457 is 754472196.

It can be written as a sum of positive squares in only one way, i.e., 618069321 + 73205136 = 24861^2 + 8556^2 .

It is not a de Polignac number, because 691274457 - 2⁷ = 691274329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (691274497) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38404128 + ... + 38404145.

It is an arithmetic number, because the mean of its divisors is an integer number (166417927).

Almost surely, 2^691274457 is an apocalyptic number.

It is an amenable number.

691274457 is a deficient number, since it is larger than the sum of its proper divisors (307233105).

691274457 is a wasteful number, since it uses less digits than its factorization.

691274457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76808279 (or 76808276 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 691274457 is about 26292.0987560902. The cubic root of 691274457 is about 884.1993064427.

The spelling of 691274457 in words is "six hundred ninety-one million, two hundred seventy-four thousand, four hundred fifty-seven".