6631901 has 2 divisors, whose sum is σ = 6631902. Its totient is φ = 6631900.

The previous prime is 6631883. The next prime is 6631903. The reversal of 6631901 is 1091366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6120676 + 511225 = 2474^2 + 715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6631901 is a prime.

It is a super-2 number, since 2×6631901² = 87964221747602, which contains 22 as substring.

Together with 6631903, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6631903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3315950 + 3315951.

It is an arithmetic number, because the mean of its divisors is an integer number (3315951).

Almost surely, 2^6631901 is an apocalyptic number.

It is an amenable number.

6631901 is a deficient number, since it is larger than the sum of its proper divisors (1).

6631901 is an equidigital number, since it uses as much as digits as its factorization.

6631901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 6631901 is about 2575.2477550713. The cubic root of 6631901 is about 187.8794779815.

The spelling of 6631901 in words is "six million, six hundred thirty-one thousand, nine hundred one".