2521604257 has 2 divisors, whose sum is σ = 2521604258. Its totient is φ = 2521604256.

The previous prime is 2521604221. The next prime is 2521604273. The reversal of 2521604257 is 7524061252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2243348496 + 278255761 = 47364^2 + 16681^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521604257 - 2¹⁹ = 2521079969 is a prime.

It is not a weakly prime, because it can be changed into another prime (2521604297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260802128 + 1260802129.

It is an arithmetic number, because the mean of its divisors is an integer number (1260802129).

Almost surely, 2^2521604257 is an apocalyptic number.

It is an amenable number.

2521604257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521604257 is an equidigital number, since it uses as much as digits as its factorization.

2521604257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 2521604257 is about 50215.5778319836. The cubic root of 2521604257 is about 1361.1071321038.

The spelling of 2521604257 in words is "two billion, five hundred twenty-one million, six hundred four thousand, two hundred fifty-seven".