691281253132 has 12 divisors (see below), whose sum is σ = 1210838975136. Its totient is φ = 345327260240.

The previous prime is 691281253127. The next prime is 691281253133. The reversal of 691281253132 is 231352182196.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (691281253133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78336619 + ... + 78345442.

It is an arithmetic number, because the mean of its divisors is an integer number (100903247928).

Almost surely, 2^691281253132 is an apocalyptic number.

It is an amenable number.

691281253132 is a deficient number, since it is larger than the sum of its proper divisors (519557722004).

691281253132 is a wasteful number, since it uses less digits than its factorization.

691281253132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156683168 (or 156683166 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The spelling of 691281253132 in words is "six hundred ninety-one billion, two hundred eighty-one million, two hundred fifty-three thousand, one hundred thirty-two".