481561921 has 2 divisors, whose sum is σ = 481561922. Its totient is φ = 481561920.

The previous prime is 481561853. The next prime is 481561961. The reversal of 481561921 is 129165184.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 479128321 + 2433600 = 21889^2 + 1560^2 .

It is a cyclic number.

It is not a de Polignac number, because 481561921 - 2⁷ = 481561793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (481561961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 240780960 + 240780961.

It is an arithmetic number, because the mean of its divisors is an integer number (240780961).

Almost surely, 2^481561921 is an apocalyptic number.

It is an amenable number.

481561921 is a deficient number, since it is larger than the sum of its proper divisors (1).

481561921 is an equidigital number, since it uses as much as digits as its factorization.

481561921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 37.

The square root of 481561921 is about 21944.5191562723. The cubic root of 481561921 is about 783.8218745552.

The spelling of 481561921 in words is "four hundred eighty-one million, five hundred sixty-one thousand, nine hundred twenty-one".