2506981 has 2 divisors, whose sum is σ = 2506982. Its totient is φ = 2506980.

The previous prime is 2506979. The next prime is 2506991. The reversal of 2506981 is 1896052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1285956 + 1221025 = 1134^2 + 1105^2 .

It is a cyclic number.

It is not a de Polignac number, because 2506981 - 2¹ = 2506979 is a prime.

It is a super-2 number, since 2×2506981² = 12569907468722, which contains 22 as substring.

Together with 2506979, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2506961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1253490 + 1253491.

It is an arithmetic number, because the mean of its divisors is an integer number (1253491).

2^2506981 is an apocalyptic number.

It is an amenable number.

2506981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2506981 is an equidigital number, since it uses as much as digits as its factorization.

2506981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2506981 is about 1583.3448771509. The cubic root of 2506981 is about 135.8470924207.

The spelling of 2506981 in words is "two million, five hundred six thousand, nine hundred eighty-one".