691130012 has 12 divisors (see below), whose sum is σ = 1229977560. Its totient is φ = 339707856.

The previous prime is 691129987. The next prime is 691130029. The reversal of 691130012 is 210031196.

It is a happy number.

691130012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 691130012.

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, 1464023 + ... + 1464494.

It is an arithmetic number, because the mean of its divisors is an integer number (102498130).

Almost surely, 2^691130012 is an apocalyptic number.

It is an amenable number.

691130012 is a deficient number, since it is larger than the sum of its proper divisors (538847548).

691130012 is a wasteful number, since it uses less digits than its factorization.

691130012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2928580 (or 2928578 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 691130012 is about 26289.3516846650. The cubic root of 691130012 is about 884.1377163057.

The spelling of 691130012 in words is "six hundred ninety-one million, one hundred thirty thousand, twelve".