6990220931 has 2 divisors, whose sum is σ = 6990220932. Its totient is φ = 6990220930.

The previous prime is 6990220879. The next prime is 6990220943. The reversal of 6990220931 is 1390220996.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6990220931 is a prime.

It is a super-2 number, since 2×6990220931² = 97726377328381013522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (6990220331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495110465 + 3495110466.

It is an arithmetic number, because the mean of its divisors is an integer number (3495110466).

Almost surely, 2^6990220931 is an apocalyptic number.

6990220931 is a deficient number, since it is larger than the sum of its proper divisors (1).

6990220931 is an equidigital number, since it uses as much as digits as its factorization.

6990220931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 6990220931 is about 83607.5411132273. The cubic root of 6990220931 is about 1912.0399730611.

The spelling of 6990220931 in words is "six billion, nine hundred ninety million, two hundred twenty thousand, nine hundred thirty-one".