2190687931 has 2 divisors, whose sum is σ = 2190687932. Its totient is φ = 2190687930.

The previous prime is 2190687929. The next prime is 2190687953. The reversal of 2190687931 is 1397860912.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2190687931 - 2¹ = 2190687929 is a prime.

It is a super-2 number, since 2×2190687931² = 9598227222058121522, which contains 22 as substring.

Together with 2190687929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2190687901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095343965 + 1095343966.

It is an arithmetic number, because the mean of its divisors is an integer number (1095343966).

Almost surely, 2^2190687931 is an apocalyptic number.

2190687931 is a deficient number, since it is larger than the sum of its proper divisors (1).

2190687931 is an equidigital number, since it uses as much as digits as its factorization.

2190687931 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2190687931 is about 46804.7853429540. The cubic root of 2190687931 is about 1298.7538217733.

The spelling of 2190687931 in words is "two billion, one hundred ninety million, six hundred eighty-seven thousand, nine hundred thirty-one".