2570921 has 2 divisors, whose sum is σ = 2570922. Its totient is φ = 2570920.

The previous prime is 2570903. The next prime is 2570933. The reversal of 2570921 is 1290752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2544025 + 26896 = 1595^2 + 164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2570921 is a prime.

It is not a weakly prime, because it can be changed into another prime (2570941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1285460 + 1285461.

It is an arithmetic number, because the mean of its divisors is an integer number (1285461).

2^2570921 is an apocalyptic number.

It is an amenable number.

2570921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2570921 is an equidigital number, since it uses as much as digits as its factorization.

2570921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 2570921 is about 1603.4091804652. The cubic root of 2570921 is about 136.9923273448.

The spelling of 2570921 in words is "two million, five hundred seventy thousand, nine hundred twenty-one".