691061908 has 12 divisors (see below), whose sum is σ = 1209688480. Its totient is φ = 345436632.

The previous prime is 691061893. The next prime is 691061911. The reversal of 691061908 is 809160196.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5568 + ... + 37591.

Almost surely, 2^691061908 is an apocalyptic number.

It is an amenable number.

691061908 is a deficient number, since it is larger than the sum of its proper divisors (518626572).

691061908 is a wasteful number, since it uses less digits than its factorization.

691061908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47166 (or 47164 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 691061908 is about 26288.0563754721. The cubic root of 691061908 is about 884.1086743542.

The spelling of 691061908 in words is "six hundred ninety-one million, sixty-one thousand, nine hundred eight".