77225531 has 2 divisors, whose sum is σ = 77225532. Its totient is φ = 77225530.

The previous prime is 77225527. The next prime is 77225539. The reversal of 77225531 is 13552277.

It is a weak prime.

It is an emirp because it is prime and its reverse (13552277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77225531 - 2² = 77225527 is a prime.

It is a super-2 number, since 2×77225531² = 11927565276463922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77225539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38612765 + 38612766.

It is an arithmetic number, because the mean of its divisors is an integer number (38612766).

Almost surely, 2^77225531 is an apocalyptic number.

77225531 is a deficient number, since it is larger than the sum of its proper divisors (1).

77225531 is an equidigital number, since it uses as much as digits as its factorization.

77225531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14700, while the sum is 32.

The square root of 77225531 is about 8787.8058126019. The cubic root of 77225531 is about 425.8470414878.

The spelling of 77225531 in words is "seventy-seven million, two hundred twenty-five thousand, five hundred thirty-one".