861432977 has 2 divisors, whose sum is σ = 861432978. Its totient is φ = 861432976.

The previous prime is 861432953. The next prime is 861432983. The reversal of 861432977 is 779234168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 859134721 + 2298256 = 29311^2 + 1516^2 .

It is a cyclic number.

It is not a de Polignac number, because 861432977 - 2²⁸ = 592997521 is a prime.

It is not a weakly prime, because it can be changed into another prime (861402977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430716488 + 430716489.

It is an arithmetic number, because the mean of its divisors is an integer number (430716489).

Almost surely, 2^861432977 is an apocalyptic number.

It is an amenable number.

861432977 is a deficient number, since it is larger than the sum of its proper divisors (1).

861432977 is an equidigital number, since it uses as much as digits as its factorization.

861432977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 47.

The square root of 861432977 is about 29350.1784832733. The cubic root of 861432977 is about 951.4964327287.

The spelling of 861432977 in words is "eight hundred sixty-one million, four hundred thirty-two thousand, nine hundred seventy-seven".