72431491 has 4 divisors (see below), whose sum is σ = 79016184. Its totient is φ = 65846800.

The previous prime is 72431483. The next prime is 72431501. The reversal of 72431491 is 19413427.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72431491 - 2³ = 72431483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72431791) 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, 3292330 + ... + 3292351.

It is an arithmetic number, because the mean of its divisors is an integer number (19754046).

Almost surely, 2^72431491 is an apocalyptic number.

72431491 is a deficient number, since it is larger than the sum of its proper divisors (6584693).

72431491 is a wasteful number, since it uses less digits than its factorization.

72431491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6584692.

The product of its digits is 6048, while the sum is 31.

The square root of 72431491 is about 8510.6692451299. The cubic root of 72431491 is about 416.8461631611.

The spelling of 72431491 in words is "seventy-two million, four hundred thirty-one thousand, four hundred ninety-one".