861280457 has 2 divisors, whose sum is σ = 861280458. Its totient is φ = 861280456.

The previous prime is 861280451. The next prime is 861280529. The reversal of 861280457 is 754082168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 849197881 + 12082576 = 29141^2 + 3476^2 .

It is a cyclic number.

It is not a de Polignac number, because 861280457 - 2⁸ = 861280201 is a prime.

It is a super-2 number, since 2×861280457² = 1483608051220257698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (861280451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430640228 + 430640229.

It is an arithmetic number, because the mean of its divisors is an integer number (430640229).

Almost surely, 2^861280457 is an apocalyptic number.

It is an amenable number.

861280457 is a deficient number, since it is larger than the sum of its proper divisors (1).

861280457 is an equidigital number, since it uses as much as digits as its factorization.

861280457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 861280457 is about 29347.5800876324. The cubic root of 861280457 is about 951.4402740545.

The spelling of 861280457 in words is "eight hundred sixty-one million, two hundred eighty thousand, four hundred fifty-seven".