1691975972 has 12 divisors (see below), whose sum is σ = 2964969840. Its totient is φ = 844841736.

The previous prime is 1691975963. The next prime is 1691975977. The reversal of 1691975972 is 2795791961.

It is not an unprimeable number, because it can be changed into a prime (1691975977) 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, 283238 + ... + 289149.

It is an arithmetic number, because the mean of its divisors is an integer number (247080820).

Almost surely, 2^1691975972 is an apocalyptic number.

It is an amenable number.

1691975972 is a deficient number, since it is larger than the sum of its proper divisors (1272993868).

1691975972 is a wasteful number, since it uses less digits than its factorization.

1691975972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573130 (or 573128 counting only the distinct ones).

The product of its digits is 2143260, while the sum is 56.

The square root of 1691975972 is about 41133.6355310347. The cubic root of 1691975972 is about 1191.6024763724.

The spelling of 1691975972 in words is "one billion, six hundred ninety-one million, nine hundred seventy-five thousand, nine hundred seventy-two".