77431149 has 12 divisors (see below), whose sum is σ = 115453312. Its totient is φ = 49955400.

The previous prime is 77431147. The next prime is 77431171. The reversal of 77431149 is 94113477.

It is not a de Polignac number, because 77431149 - 2¹ = 77431147 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77431147) 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 in 11 ways as a sum of consecutive naturals, for example, 138487 + ... + 139044.

Almost surely, 2^77431149 is an apocalyptic number.

It is an amenable number.

77431149 is a deficient number, since it is larger than the sum of its proper divisors (38022163).

77431149 is a wasteful number, since it uses less digits than its factorization.

77431149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277568 (or 277565 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 77431149 is about 8799.4970879022. The cubic root of 77431149 is about 426.2246550290.

The spelling of 77431149 in words is "seventy-seven million, four hundred thirty-one thousand, one hundred forty-nine".