6996781 has 4 divisors (see below), whose sum is σ = 7632864. Its totient is φ = 6360700.

The previous prime is 6996739. The next prime is 6996823. The reversal of 6996781 is 1876996.

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 an interprime number because it is at equal distance from previous prime (6996739) and next prime (6996823).

It is a cyclic number.

It is not a de Polignac number, because 6996781 - 2⁷ = 6996653 is a prime.

It is a super-2 number, since 2×6996781² = 97909888723922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6996701) 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, 318025 + ... + 318046.

It is an arithmetic number, because the mean of its divisors is an integer number (1908216).

Almost surely, 2^6996781 is an apocalyptic number.

It is an amenable number.

6996781 is a deficient number, since it is larger than the sum of its proper divisors (636083).

6996781 is a wasteful number, since it uses less digits than its factorization.

6996781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636082.

The product of its digits is 163296, while the sum is 46.

The square root of 6996781 is about 2645.1429072925. The cubic root of 6996781 is about 191.2637912791.

It can be divided in two parts, 6996 and 781, that added together give a palindrome (7777).

The spelling of 6996781 in words is "six million, nine hundred ninety-six thousand, seven hundred eighty-one".