2597981 has 2 divisors, whose sum is σ = 2597982. Its totient is φ = 2597980.

The previous prime is 2597977. The next prime is 2598091. The reversal of 2597981 is 1897952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2059225 + 538756 = 1435^2 + 734^2 .

It is a cyclic number.

It is not a de Polignac number, because 2597981 - 2² = 2597977 is a prime.

It is a super-2 number, since 2×2597981² = 13499010552722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2597911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1298990 + 1298991.

It is an arithmetic number, because the mean of its divisors is an integer number (1298991).

2^2597981 is an apocalyptic number.

It is an amenable number.

2597981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2597981 is an equidigital number, since it uses as much as digits as its factorization.

2597981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 41.

The square root of 2597981 is about 1611.8253627487. The cubic root of 2597981 is about 137.4712843615.

The spelling of 2597981 in words is "two million, five hundred ninety-seven thousand, nine hundred eighty-one".