6998995631 has 2 divisors, whose sum is σ = 6998995632. Its totient is φ = 6998995630.

The previous prime is 6998995561. The next prime is 6998995697. The reversal of 6998995631 is 1365998996.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6998995631 - 2¹⁸ = 6998733487 is a prime.

It is a super-2 number, since 2×6998995631² = 97971879685514176322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6998995831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3499497815 + 3499497816.

It is an arithmetic number, because the mean of its divisors is an integer number (3499497816).

Almost surely, 2^6998995631 is an apocalyptic number.

6998995631 is a deficient number, since it is larger than the sum of its proper divisors (1).

6998995631 is an equidigital number, since it uses as much as digits as its factorization.

6998995631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28343520, while the sum is 65.

The square root of 6998995631 is about 83660.0001852737. Note that the first 3 decimals coincide. The cubic root of 6998995631 is about 1912.8396884545.

The spelling of 6998995631 in words is "six billion, nine hundred ninety-eight million, nine hundred ninety-five thousand, six hundred thirty-one".