691965012 has 48 divisors (see below), whose sum is σ = 1691604992. Its totient is φ = 219875040.

The previous prime is 691965011. The next prime is 691965017. The reversal of 691965012 is 210569196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691965011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11043 + ... + 38805.

Almost surely, 2^691965012 is an apocalyptic number.

691965012 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

691965012 is an abundant number, since it is smaller than the sum of its proper divisors (999639980).

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

691965012 is a wasteful number, since it uses less digits than its factorization.

691965012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27868 (or 27866 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 691965012 is about 26305.2278454303. The cubic root of 691965012 is about 884.4936348102.

The spelling of 691965012 in words is "six hundred ninety-one million, nine hundred sixty-five thousand, twelve".