861280451 has 2 divisors, whose sum is σ = 861280452. Its totient is φ = 861280450.

The previous prime is 861280447. The next prime is 861280457. The reversal of 861280451 is 154082168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861280451 - 2² = 861280447 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (861280457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430640225 + 430640226.

It is an arithmetic number, because the mean of its divisors is an integer number (430640226).

Almost surely, 2^861280451 is an apocalyptic number.

861280451 is a deficient number, since it is larger than the sum of its proper divisors (1).

861280451 is an equidigital number, since it uses as much as digits as its factorization.

861280451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 861280451 is about 29347.5799854094. The cubic root of 861280451 is about 951.4402718452.

The spelling of 861280451 in words is "eight hundred sixty-one million, two hundred eighty thousand, four hundred fifty-one".