72501511 has 4 divisors (see below), whose sum is σ = 76317400. Its totient is φ = 68685624.

The previous prime is 72501503. The next prime is 72501521. The reversal of 72501511 is 11510527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11510527 = 7 ⋅1644361.

It is a cyclic number.

It is not a de Polignac number, because 72501511 - 2³ = 72501503 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 (72501521) 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, 1907916 + ... + 1907953.

It is an arithmetic number, because the mean of its divisors is an integer number (19079350).

Almost surely, 2^72501511 is an apocalyptic number.

72501511 is a deficient number, since it is larger than the sum of its proper divisors (3815889).

72501511 is a wasteful number, since it uses less digits than its factorization.

72501511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3815888.

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 72501511 is about 8514.7819114761. The cubic root of 72501511 is about 416.9804425457.

The spelling of 72501511 in words is "seventy-two million, five hundred one thousand, five hundred eleven".