77432081 has 2 divisors, whose sum is σ = 77432082. Its totient is φ = 77432080.

The previous prime is 77432063. The next prime is 77432107. The reversal of 77432081 is 18023477.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52432081 + 25000000 = 7241^2 + 5000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77432081 is a prime.

It is a super-2 number, since 2×77432081² = 11991454335981122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (77432041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38716040 + 38716041.

It is an arithmetic number, because the mean of its divisors is an integer number (38716041).

Almost surely, 2^77432081 is an apocalyptic number.

It is an amenable number.

77432081 is a deficient number, since it is larger than the sum of its proper divisors (1).

77432081 is an equidigital number, since it uses as much as digits as its factorization.

77432081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 77432081 is about 8799.5500453148. The cubic root of 77432081 is about 426.2263651065.

The spelling of 77432081 in words is "seventy-seven million, four hundred thirty-two thousand, eighty-one".