72631331 has 2 divisors, whose sum is σ = 72631332. Its totient is φ = 72631330.

The previous prime is 72631313. The next prime is 72631373. The reversal of 72631331 is 13313627.

Together with previous prime (72631313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72631331 - 2⁶ = 72631267 is a prime.

It is a super-2 number, since 2×72631331² = 10550620485663122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72631331.

It is not a weakly prime, because it can be changed into another prime (72631831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36315665 + 36315666.

It is an arithmetic number, because the mean of its divisors is an integer number (36315666).

Almost surely, 2^72631331 is an apocalyptic number.

72631331 is a deficient number, since it is larger than the sum of its proper divisors (1).

72631331 is an equidigital number, since it uses as much as digits as its factorization.

72631331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 26.

The square root of 72631331 is about 8522.4017154790. The cubic root of 72631331 is about 417.2291735624.

Adding to 72631331 its reverse (13313627), we get a palindrome (85944958).

The spelling of 72631331 in words is "seventy-two million, six hundred thirty-one thousand, three hundred thirty-one".