691661962 has 4 divisors (see below), whose sum is σ = 1037492946. Its totient is φ = 345830980.

The previous prime is 691661951. The next prime is 691661989. The reversal of 691661962 is 269166196.

691661962 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 662599081 + 29062881 = 25741^2 + 5391^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172915489 + ... + 172915492.

Almost surely, 2^691661962 is an apocalyptic number.

691661962 is a deficient number, since it is larger than the sum of its proper divisors (345830984).

691661962 is a wasteful number, since it uses less digits than its factorization.

691661962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345830983.

The product of its digits is 209952, while the sum is 46.

The square root of 691661962 is about 26299.4669527730. The cubic root of 691661962 is about 884.3644929550.

The spelling of 691661962 in words is "six hundred ninety-one million, six hundred sixty-one thousand, nine hundred sixty-two".