861013577 has 2 divisors, whose sum is σ = 861013578. Its totient is φ = 861013576.

The previous prime is 861013537. The next prime is 861013589. The reversal of 861013577 is 775310168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 688327696 + 172685881 = 26236^2 + 13141^2 .

It is a cyclic number.

It is not a de Polignac number, because 861013577 - 2¹⁰ = 861012553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861013577.

It is not a weakly prime, because it can be changed into another prime (861013537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430506788 + 430506789.

It is an arithmetic number, because the mean of its divisors is an integer number (430506789).

Almost surely, 2^861013577 is an apocalyptic number.

It is an amenable number.

861013577 is a deficient number, since it is larger than the sum of its proper divisors (1).

861013577 is an equidigital number, since it uses as much as digits as its factorization.

861013577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 861013577 is about 29343.0328527915. The cubic root of 861013577 is about 951.3419914685.

The spelling of 861013577 in words is "eight hundred sixty-one million, thirteen thousand, five hundred seventy-seven".