72515491 has 4 divisors (see below), whose sum is σ = 72533032. Its totient is φ = 72497952.

The previous prime is 72515483. The next prime is 72515537. The reversal of 72515491 is 19451527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19451527 = 181 ⋅107467.

It is a cyclic number.

It is not a de Polignac number, because 72515491 - 2³ = 72515483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72515431) 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, 1240 + ... + 12106.

It is an arithmetic number, because the mean of its divisors is an integer number (18133258).

Almost surely, 2^72515491 is an apocalyptic number.

72515491 is a deficient number, since it is larger than the sum of its proper divisors (17541).

72515491 is a wasteful number, since it uses less digits than its factorization.

72515491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17540.

The product of its digits is 12600, while the sum is 34.

The square root of 72515491 is about 8515.6027972188. The cubic root of 72515491 is about 417.0072420421.

The spelling of 72515491 in words is "seventy-two million, five hundred fifteen thousand, four hundred ninety-one".