2501881 has 2 divisors, whose sum is σ = 2501882. Its totient is φ = 2501880.

The previous prime is 2501843. The next prime is 2501897. The reversal of 2501881 is 1881052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1836025 + 665856 = 1355^2 + 816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2501881 is a prime.

It is a super-2 number, since 2×2501881² = 12518817076322, which contains 22 as substring.

2501881 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2501281) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250940 + 1250941.

It is an arithmetic number, because the mean of its divisors is an integer number (1250941).

2^2501881 is an apocalyptic number.

It is an amenable number.

2501881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2501881 is an equidigital number, since it uses as much as digits as its factorization.

2501881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 2501881 is about 1581.7335426677. The cubic root of 2501881 is about 135.7549110933.

The spelling of 2501881 in words is "two million, five hundred one thousand, eight hundred eighty-one".