72994531 has 4 divisors (see below), whose sum is σ = 73431792. Its totient is φ = 72557272.

The previous prime is 72994529. The next prime is 72994541. The reversal of 72994531 is 13549927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13549927 = 53 ⋅255659.

It is a cyclic number.

It is not a de Polignac number, because 72994531 - 2¹ = 72994529 is a prime.

It is a super-2 number, since 2×72994531² = 10656403111819922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72994501) 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, 218380 + ... + 218713.

It is an arithmetic number, because the mean of its divisors is an integer number (18357948).

Almost surely, 2^72994531 is an apocalyptic number.

72994531 is the 5404-th centered pentagonal number.

72994531 is a deficient number, since it is larger than the sum of its proper divisors (437261).

72994531 is a wasteful number, since it uses less digits than its factorization.

72994531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437260.

The product of its digits is 68040, while the sum is 40.

The square root of 72994531 is about 8543.6836903060. The cubic root of 72994531 is about 417.9234824797.

The spelling of 72994531 in words is "seventy-two million, nine hundred ninety-four thousand, five hundred thirty-one".