691601916 has 12 divisors (see below), whose sum is σ = 1613737832. Its totient is φ = 230533968.

The previous prime is 691601903. The next prime is 691601921. The reversal of 691601916 is 619106196.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 28816735 + ... + 28816758.

Almost surely, 2^691601916 is an apocalyptic number.

It is an amenable number.

691601916 is an abundant number, since it is smaller than the sum of its proper divisors (922135916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691601916 is a wasteful number, since it uses less digits than its factorization.

691601916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57633500 (or 57633498 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 691601916 is about 26298.3253459227. The cubic root of 691601916 is about 884.3389004497.

The spelling of 691601916 in words is "six hundred ninety-one million, six hundred one thousand, nine hundred sixteen".