861463921 has 2 divisors, whose sum is σ = 861463922. Its totient is φ = 861463920.

The previous prime is 861463907. The next prime is 861463927. The reversal of 861463921 is 129364168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531533025 + 329930896 = 23055^2 + 18164^2 .

It is a cyclic number.

It is not a de Polignac number, because 861463921 - 2⁷ = 861463793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (861463927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430731960 + 430731961.

It is an arithmetic number, because the mean of its divisors is an integer number (430731961).

Almost surely, 2^861463921 is an apocalyptic number.

It is an amenable number.

861463921 is a deficient number, since it is larger than the sum of its proper divisors (1).

861463921 is an equidigital number, since it uses as much as digits as its factorization.

861463921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 861463921 is about 29350.7056303592. The cubic root of 861463921 is about 951.5078256650.

The spelling of 861463921 in words is "eight hundred sixty-one million, four hundred sixty-three thousand, nine hundred twenty-one".