691996586 has 4 divisors (see below), whose sum is σ = 1037994882. Its totient is φ = 345998292.

The previous prime is 691996541. The next prime is 691996589. The reversal of 691996586 is 685699196.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 479391025 + 212605561 = 21895^2 + 14581^2 .

It is not an unprimeable number, because it can be changed into a prime (691996589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172999145 + ... + 172999148.

Almost surely, 2^691996586 is an apocalyptic number.

691996586 is a deficient number, since it is larger than the sum of its proper divisors (345998296).

691996586 is a wasteful number, since it uses less digits than its factorization.

691996586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345998295.

The product of its digits is 6298560, while the sum is 59.

The square root of 691996586 is about 26305.8279854484. The cubic root of 691996586 is about 884.5070875989.

The spelling of 691996586 in words is "six hundred ninety-one million, nine hundred ninety-six thousand, five hundred eighty-six".