691402012 has 24 divisors (see below), whose sum is σ = 1385717760. Its totient is φ = 295690800.

The previous prime is 691402009. The next prime is 691402027. The reversal of 691402012 is 210204196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12364 + ... + 39187.

It is an arithmetic number, because the mean of its divisors is an integer number (57738240).

Almost surely, 2^691402012 is an apocalyptic number.

It is an amenable number.

691402012 is an abundant number, since it is smaller than the sum of its proper divisors (694315748).

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

691402012 is a wasteful number, since it uses less digits than its factorization.

691402012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52041 (or 52039 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 691402012 is about 26294.5243729564. The cubic root of 691402012 is about 884.2536876923.

The spelling of 691402012 in words is "six hundred ninety-one million, four hundred two thousand, twelve".