6657631 has 2 divisors, whose sum is σ = 6657632. Its totient is φ = 6657630.

The previous prime is 6657613. The next prime is 6657661. The reversal of 6657631 is 1367566.

It is a happy number.

Together with previous prime (6657613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6657631 - 2¹⁹ = 6133343 is a prime.

It is a super-2 number, since 2×6657631² = 88648101064322, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6657661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328815 + 3328816.

It is an arithmetic number, because the mean of its divisors is an integer number (3328816).

Almost surely, 2^6657631 is an apocalyptic number.

6657631 is a deficient number, since it is larger than the sum of its proper divisors (1).

6657631 is an equidigital number, since it uses as much as digits as its factorization.

6657631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 34.

The square root of 6657631 is about 2580.2385548627. The cubic root of 6657631 is about 188.1221384538.

The spelling of 6657631 in words is "six million, six hundred fifty-seven thousand, six hundred thirty-one".