172891731292 has 12 divisors (see below), whose sum is σ = 345783462640. Its totient is φ = 74096456256.

The previous prime is 172891731283. The next prime is 172891731307. The reversal of 172891731292 is 292137198271.

172891731292 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, 3087352317 + ... + 3087352372.

Almost surely, 2^172891731292 is an apocalyptic number.

It is an amenable number.

172891731292 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.

172891731292 is a wasteful number, since it uses less digits than its factorization.

172891731292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6174704700 (or 6174704698 counting only the distinct ones).

The product of its digits is 762048, while the sum is 52.

The spelling of 172891731292 in words is "one hundred seventy-two billion, eight hundred ninety-one million, seven hundred thirty-one thousand, two hundred ninety-two".