2653981 has 4 divisors (see below), whose sum is σ = 2895264. Its totient is φ = 2412700.

The previous prime is 2653979. The next prime is 2653991. The reversal of 2653981 is 1893562.

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 2653981 - 2¹ = 2653979 is a prime.

It is a super-2 number, since 2×2653981² = 14087230296722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2653951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120625 + ... + 120646.

It is an arithmetic number, because the mean of its divisors is an integer number (723816).

2^2653981 is an apocalyptic number.

It is an amenable number.

2653981 is a deficient number, since it is larger than the sum of its proper divisors (241283).

2653981 is a wasteful number, since it uses less digits than its factorization.

2653981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241282.

The product of its digits is 12960, while the sum is 34.

The square root of 2653981 is about 1629.1043551596. The cubic root of 2653981 is about 138.4520115082.

The spelling of 2653981 in words is "two million, six hundred fifty-three thousand, nine hundred eighty-one".