6369981 has 4 divisors (see below), whose sum is σ = 8493312. Its totient is φ = 4246652.

The previous prime is 6369971. The next prime is 6369983. The reversal of 6369981 is 1899636.

6369981 is digitally balanced in base 4, 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, 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 6369981 - 2⁵ = 6369949 is a prime.

It is a super-2 number, since 2×6369981² = 81153315880722, 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 (6369983) 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, 1061661 + ... + 1061666.

It is an arithmetic number, because the mean of its divisors is an integer number (2123328).

Almost surely, 2^6369981 is an apocalyptic number.

It is an amenable number.

6369981 is a deficient number, since it is larger than the sum of its proper divisors (2123331).

6369981 is a wasteful number, since it uses less digits than its factorization.

6369981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123330.

The product of its digits is 69984, while the sum is 42.

The square root of 6369981 is about 2523.8821287849. The cubic root of 6369981 is about 185.3728152720.

The spelling of 6369981 in words is "six million, three hundred sixty-nine thousand, nine hundred eighty-one".