72491 has 4 divisors (see below), whose sum is σ = 73584. Its totient is φ = 71400.

The previous prime is 72481. The next prime is 72493. The reversal of 72491 is 19427.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72493) 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, 440 + ... + 581.

It is an arithmetic number, because the mean of its divisors is an integer number (18396).

2⁷²⁴⁹¹ is an apocalyptic number.

72491 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

72491 is a deficient number, since it is larger than the sum of its proper divisors (1093).

72491 is a wasteful number, since it uses less digits than its factorization.

72491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092.

The product of its digits is 504, while the sum is 23.

The square root of 72491 is about 269.2415272576. The cubic root of 72491 is about 41.6960290813.

The spelling of 72491 in words is "seventy-two thousand, four hundred ninety-one".