691946212 has 6 divisors (see below), whose sum is σ = 1210905878. Its totient is φ = 345973104.

The previous prime is 691946179. The next prime is 691946221. The reversal of 691946212 is 212649196.

It can be written as a sum of positive squares in only one way, i.e., 691900416 + 45796 = 26304^2 + 214^2 .

It is a super-2 number, since 2×691946212² = 957579120602297888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86493273 + ... + 86493280.

Almost surely, 2^691946212 is an apocalyptic number.

It is an amenable number.

691946212 is a deficient number, since it is larger than the sum of its proper divisors (518959666).

691946212 is a wasteful number, since it uses less digits than its factorization.

691946212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172986557 (or 172986555 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 691946212 is about 26304.8704995862. The cubic root of 691946212 is about 884.4856244674.

The spelling of 691946212 in words is "six hundred ninety-one million, nine hundred forty-six thousand, two hundred twelve".