77477131 has 2 divisors, whose sum is σ = 77477132. Its totient is φ = 77477130.

The previous prime is 77477083. The next prime is 77477171. The reversal of 77477131 is 13177477.

It is a strong prime.

It is an emirp because it is prime and its reverse (13177477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77477131 - 2²¹ = 75379979 is a prime.

It is a super-2 number, since 2×77477131² = 12005411655982322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77477171) 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, 38738565 + 38738566.

It is an arithmetic number, because the mean of its divisors is an integer number (38738566).

Almost surely, 2^77477131 is an apocalyptic number.

77477131 is a deficient number, since it is larger than the sum of its proper divisors (1).

77477131 is an equidigital number, since it uses as much as digits as its factorization.

77477131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28812, while the sum is 37.

The square root of 77477131 is about 8802.1094630776. The cubic root of 77477131 is about 426.3090086090.

It can be divided in two parts, 7747 and 7131, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 77477131 in words is "seventy-seven million, four hundred seventy-seven thousand, one hundred thirty-one".