77879531 has 2 divisors, whose sum is σ = 77879532. Its totient is φ = 77879530.

The previous prime is 77879497. The next prime is 77879569. The reversal of 77879531 is 13597877.

It is a weak prime.

It is an emirp because it is prime and its reverse (13597877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77879531 - 2¹⁴ = 77863147 is a prime.

It is a super-2 number, since 2×77879531² = 12130442697559922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77879231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38939765 + 38939766.

It is an arithmetic number, because the mean of its divisors is an integer number (38939766).

Almost surely, 2^77879531 is an apocalyptic number.

77879531 is a deficient number, since it is larger than the sum of its proper divisors (1).

77879531 is an equidigital number, since it uses as much as digits as its factorization.

77879531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 370440, while the sum is 47.

The square root of 77879531 is about 8824.9380167795. The cubic root of 77879531 is about 427.0457877687.

The spelling of 77879531 in words is "seventy-seven million, eight hundred seventy-nine thousand, five hundred thirty-one".