691542436 has 12 divisors (see below), whose sum is σ = 1303291612. Its totient is φ = 319173408.

The previous prime is 691542413. The next prime is 691542499. The reversal of 691542436 is 634245196.

It can be written as a sum of positive squares in 2 ways, for example, as 301716900 + 389825536 = 17370^2 + 19744^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6649395 + ... + 6649498.

Almost surely, 2^691542436 is an apocalyptic number.

It is an amenable number.

691542436 is a deficient number, since it is larger than the sum of its proper divisors (611749176).

691542436 is a wasteful number, since it uses less digits than its factorization.

691542436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13298910 (or 13298908 counting only the distinct ones).

The product of its digits is 155520, while the sum is 40.

The square root of 691542436 is about 26297.1944511197. The cubic root of 691542436 is about 884.3135477217.

The spelling of 691542436 in words is "six hundred ninety-one million, five hundred forty-two thousand, four hundred thirty-six".