76221631 has 2 divisors, whose sum is σ = 76221632. Its totient is φ = 76221630.

The previous prime is 76221619. The next prime is 76221637. The reversal of 76221631 is 13612267.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 76221631 - 2⁷ = 76221503 is a prime.

It is a super-2 number, since 2×76221631² = 11619474064600322, which contains 22 as substring.

It is a Chen prime.

It is the 8731-st Hogben number.

It is a self number, because there is not a number n which added to its sum of digits gives 76221631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76221637) by changing a digit.

It is a nontrivial repunit in base 8730.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38110815 + 38110816.

It is an arithmetic number, because the mean of its divisors is an integer number (38110816).

Almost surely, 2^76221631 is an apocalyptic number.

76221631 is a deficient number, since it is larger than the sum of its proper divisors (1).

76221631 is an equidigital number, since it uses as much as digits as its factorization.

76221631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 28.

The square root of 76221631 is about 8730.5000429529. The cubic root of 76221631 is about 423.9937087443.

Adding to 76221631 its reverse (13612267), we get a palindrome (89833898).

The spelling of 76221631 in words is "seventy-six million, two hundred twenty-one thousand, six hundred thirty-one".