172138732501 has 8 divisors (see below), whose sum is σ = 173126790200. Its totient is φ = 171151081920.

The previous prime is 172138732499. The next prime is 172138732603. The reversal of 172138732501 is 105237831271.

It can be written as a sum of positive squares in 4 ways, for example, as 1095279025 + 171043453476 = 33095^2 + 413574^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172138732501 - 2¹ = 172138732499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172138732001) 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, 767515 + ... + 966103.

It is an arithmetic number, because the mean of its divisors is an integer number (21640848775).

Almost surely, 2^172138732501 is an apocalyptic number.

It is an amenable number.

172138732501 is a deficient number, since it is larger than the sum of its proper divisors (988057699).

172138732501 is a wasteful number, since it uses less digits than its factorization.

172138732501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203559.

The product of its (nonzero) digits is 70560, while the sum is 40.

The spelling of 172138732501 in words is "one hundred seventy-two billion, one hundred thirty-eight million, seven hundred thirty-two thousand, five hundred one".