2501561989 has 2 divisors, whose sum is σ = 2501561990. Its totient is φ = 2501561988.

The previous prime is 2501561977. The next prime is 2501562031. The reversal of 2501561989 is 9891651052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1979805025 + 521756964 = 44495^2 + 22842^2 .

It is a cyclic number.

It is not a de Polignac number, because 2501561989 - 2²⁹ = 1964691077 is a prime.

It is a super-2 number, since 2×2501561989² = 12515624769619272242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2501562989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250780994 + 1250780995.

It is an arithmetic number, because the mean of its divisors is an integer number (1250780995).

Almost surely, 2^2501561989 is an apocalyptic number.

It is an amenable number.

2501561989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2501561989 is an equidigital number, since it uses as much as digits as its factorization.

2501561989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 46.

The square root of 2501561989 is about 50015.6174509523. The cubic root of 2501561989 is about 1357.4914088137.

The spelling of 2501561989 in words is "two billion, five hundred one million, five hundred sixty-one thousand, nine hundred eighty-nine".