416564921 has 2 divisors, whose sum is σ = 416564922. Its totient is φ = 416564920.

The previous prime is 416564917. The next prime is 416564947. The reversal of 416564921 is 129465614.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 413674921 + 2890000 = 20339^2 + 1700^2 .

It is a cyclic number.

It is not a de Polignac number, because 416564921 - 2² = 416564917 is a prime.

It is not a weakly prime, because it can be changed into another prime (416564221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208282460 + 208282461.

It is an arithmetic number, because the mean of its divisors is an integer number (208282461).

Almost surely, 2^416564921 is an apocalyptic number.

It is an amenable number.

416564921 is a deficient number, since it is larger than the sum of its proper divisors (1).

416564921 is an equidigital number, since it uses as much as digits as its factorization.

416564921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 416564921 is about 20409.9221213605. The cubic root of 416564921 is about 746.8399910085.

The spelling of 416564921 in words is "four hundred sixteen million, five hundred sixty-four thousand, nine hundred twenty-one".