73131631 has 2 divisors, whose sum is σ = 73131632. Its totient is φ = 73131630.

The previous prime is 73131623. The next prime is 73131677. The reversal of 73131631 is 13613137.

It is a weak prime.

It is an emirp because it is prime and its reverse (13613137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73131631 - 2³ = 73131623 is a prime.

It is a super-2 number, since 2×73131631² = 10696470905440322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 73131596 and 73131605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73131431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36565815 + 36565816.

It is an arithmetic number, because the mean of its divisors is an integer number (36565816).

Almost surely, 2^73131631 is an apocalyptic number.

73131631 is a deficient number, since it is larger than the sum of its proper divisors (1).

73131631 is an equidigital number, since it uses as much as digits as its factorization.

73131631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134, while the sum is 25.

The square root of 73131631 is about 8551.7033975694. The cubic root of 73131631 is about 418.1849699897.

Adding to 73131631 its reverse (13613137), we get a palindrome (86744768).

The spelling of 73131631 in words is "seventy-three million, one hundred thirty-one thousand, six hundred thirty-one".