2636981 has 4 divisors (see below), whose sum is σ = 2666700. Its totient is φ = 2607264.

The previous prime is 2636971. The next prime is 2636983. The reversal of 2636981 is 1896362.

2636981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1500625 + 1136356 = 1225^2 + 1066^2 .

It is a cyclic number.

It is not a de Polignac number, because 2636981 - 2⁶ = 2636917 is a prime.

It is a super-2 number, since 2×2636981² = 13907337588722, 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 (2636983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14726 + ... + 14903.

It is an arithmetic number, because the mean of its divisors is an integer number (666675).

2^2636981 is an apocalyptic number.

It is an amenable number.

2636981 is a deficient number, since it is larger than the sum of its proper divisors (29719).

2636981 is an equidigital number, since it uses as much as digits as its factorization.

2636981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29718.

The product of its digits is 15552, while the sum is 35.

The square root of 2636981 is about 1623.8783821457. The cubic root of 2636981 is about 138.1557612534.

The spelling of 2636981 in words is "two million, six hundred thirty-six thousand, nine hundred eighty-one".