691375144 has 32 divisors (see below), whose sum is σ = 1358150400. Its totient is φ = 329535360.

The previous prime is 691375133. The next prime is 691375171. The reversal of 691375144 is 441573196.

It is a junction number, because it is equal to n+sod(n) for n = 691375097 and 691375106.

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, 4189 + ... + 37420.

It is an arithmetic number, because the mean of its divisors is an integer number (42442200).

Almost surely, 2^691375144 is an apocalyptic number.

It is an amenable number.

691375144 is a deficient number, since it is larger than the sum of its proper divisors (666775256).

691375144 is a wasteful number, since it uses less digits than its factorization.

691375144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41713 (or 41709 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 691375144 is about 26294.0134631440. The cubic root of 691375144 is about 884.2422334609.

The spelling of 691375144 in words is "six hundred ninety-one million, three hundred seventy-five thousand, one hundred forty-four".