72551131 has 4 divisors (see below), whose sum is σ = 75705552. Its totient is φ = 69396712.

The previous prime is 72551081. The next prime is 72551147. The reversal of 72551131 is 13115527.

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 72551131 - 2⁹ = 72550619 is a prime.

It is a super-2 number, since 2×72551131² = 10527333218758322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72551096 and 72551105.

It is not an unprimeable number, because it can be changed into a prime (72531131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1577176 + ... + 1577221.

It is an arithmetic number, because the mean of its divisors is an integer number (18926388).

Almost surely, 2^72551131 is an apocalyptic number.

72551131 is a deficient number, since it is larger than the sum of its proper divisors (3154421).

72551131 is a wasteful number, since it uses less digits than its factorization.

72551131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3154420.

The product of its digits is 1050, while the sum is 25.

The square root of 72551131 is about 8517.6951694693. The cubic root of 72551131 is about 417.0755479252.

Adding to 72551131 its reverse (13115527), we get a palindrome (85666658).

The spelling of 72551131 in words is "seventy-two million, five hundred fifty-one thousand, one hundred thirty-one".