72233131 has 4 divisors (see below), whose sum is σ = 74563264. Its totient is φ = 69903000.

The previous prime is 72233111. The next prime is 72233141. The reversal of 72233131 is 13133227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13133227 = 337 ⋅38971.

It is a cyclic number.

It is not a de Polignac number, because 72233131 - 2⁹ = 72232619 is a prime.

It is a super-2 number, since 2×72233131² = 10435250428126322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72233111) 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, 1165020 + ... + 1165081.

It is an arithmetic number, because the mean of its divisors is an integer number (18640816).

Almost surely, 2^72233131 is an apocalyptic number.

72233131 is a deficient number, since it is larger than the sum of its proper divisors (2330133).

72233131 is a wasteful number, since it uses less digits than its factorization.

72233131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330132.

The product of its digits is 756, while the sum is 22.

The square root of 72233131 is about 8499.0076479551. The cubic root of 72233131 is about 416.4652919892.

Adding to 72233131 its reverse (13133227), we get a palindrome (85366358).

The spelling of 72233131 in words is "seventy-two million, two hundred thirty-three thousand, one hundred thirty-one".