1321173172 has 24 divisors (see below), whose sum is σ = 2546736192. Its totient is φ = 594700800.

The previous prime is 1321173163. The next prime is 1321173179. The reversal of 1321173172 is 2713711231.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1321173172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321173179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141229 + ... + 150292.

It is an arithmetic number, because the mean of its divisors is an integer number (106114008).

Almost surely, 2^1321173172 is an apocalyptic number.

It is an amenable number.

1321173172 is a deficient number, since it is larger than the sum of its proper divisors (1225563020).

1321173172 is a wasteful number, since it uses less digits than its factorization.

1321173172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291639 (or 291637 counting only the distinct ones).

The product of its digits is 1764, while the sum is 28.

The square root of 1321173172 is about 36347.9459117018. The cubic root of 1321173172 is about 1097.2861951391.

The spelling of 1321173172 in words is "one billion, three hundred twenty-one million, one hundred seventy-three thousand, one hundred seventy-two".