2521125209 has 2 divisors, whose sum is σ = 2521125210. Its totient is φ = 2521125208.

The previous prime is 2521125193. The next prime is 2521125263. The reversal of 2521125209 is 9025211252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1981585225 + 539539984 = 44515^2 + 23228^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521125209 - 2⁴ = 2521125193 is a prime.

It is not a weakly prime, because it can be changed into another prime (2521121209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260562604 + 1260562605.

It is an arithmetic number, because the mean of its divisors is an integer number (1260562605).

Almost surely, 2^2521125209 is an apocalyptic number.

It is an amenable number.

2521125209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521125209 is an equidigital number, since it uses as much as digits as its factorization.

2521125209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 2521125209 is about 50210.8076911734. The cubic root of 2521125209 is about 1361.0209334147.

The spelling of 2521125209 in words is "two billion, five hundred twenty-one million, one hundred twenty-five thousand, two hundred nine".