1721172572 has 12 divisors (see below), whose sum is σ = 3442345200. Its totient is φ = 737645376.

The previous prime is 1721172517. The next prime is 1721172617. The reversal of 1721172572 is 2752711271.

1721172572 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30735197 + ... + 30735252.

It is an arithmetic number, because the mean of its divisors is an integer number (286862100).

Almost surely, 2^1721172572 is an apocalyptic number.

It is an amenable number.

1721172572 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1721172572 is a wasteful number, since it uses less digits than its factorization.

1721172572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61470460 (or 61470458 counting only the distinct ones).

The product of its digits is 13720, while the sum is 35.

The square root of 1721172572 is about 41487.0169089078. The cubic root of 1721172572 is about 1198.4174908232.

The spelling of 1721172572 in words is "one billion, seven hundred twenty-one million, one hundred seventy-two thousand, five hundred seventy-two".