7681631 has 2 divisors, whose sum is σ = 7681632. Its totient is φ = 7681630.

The previous prime is 7681613. The next prime is 7681651. The reversal of 7681631 is 1361867.

Together with previous prime (7681613) 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 7681631 - 2¹⁴ = 7665247 is a prime.

It is a super-2 number, since 2×7681631² = 118014909640322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7681651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3840815 + 3840816.

It is an arithmetic number, because the mean of its divisors is an integer number (3840816).

Almost surely, 2^7681631 is an apocalyptic number.

7681631 is a deficient number, since it is larger than the sum of its proper divisors (1).

7681631 is an equidigital number, since it uses as much as digits as its factorization.

7681631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 7681631 is about 2771.5755447038. The cubic root of 7681631 is about 197.3109315964.

The spelling of 7681631 in words is "seven million, six hundred eighty-one thousand, six hundred thirty-one".