2490981 has 4 divisors (see below), whose sum is σ = 3321312. Its totient is φ = 1660652.

The previous prime is 2490973. The next prime is 2490997. The reversal of 2490981 is 1890942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2490981 - 2³ = 2490973 is a prime.

It is a super-2 number, since 2×2490981² = 12409972684722, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2490931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415161 + ... + 415166.

It is an arithmetic number, because the mean of its divisors is an integer number (830328).

2^2490981 is an apocalyptic number.

It is an amenable number.

2490981 is a deficient number, since it is larger than the sum of its proper divisors (830331).

2490981 is an equidigital number, since it uses as much as digits as its factorization.

2490981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830330.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 2490981 is about 1578.2841949408. The cubic root of 2490981 is about 135.5574752881.

The spelling of 2490981 in words is "two million, four hundred ninety thousand, nine hundred eighty-one".