691696252 has 24 divisors (see below), whose sum is σ = 1318237200. Its totient is φ = 315655296.

The previous prime is 691696249. The next prime is 691696253. The reversal of 691696252 is 252696196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691696253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70102 + ... + 79357.

It is an arithmetic number, because the mean of its divisors is an integer number (54926550).

Almost surely, 2^691696252 is an apocalyptic number.

It is an amenable number.

691696252 is a deficient number, since it is larger than the sum of its proper divisors (626540948).

691696252 is a wasteful number, since it uses less digits than its factorization.

691696252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149565 (or 149563 counting only the distinct ones).

The product of its digits is 349920, while the sum is 46.

The square root of 691696252 is about 26300.1188590470. The cubic root of 691696252 is about 884.3791072025.

The spelling of 691696252 in words is "six hundred ninety-one million, six hundred ninety-six thousand, two hundred fifty-two".