7861631 has 4 divisors (see below), whose sum is σ = 8115264. Its totient is φ = 7608000.

The previous prime is 7861613. The next prime is 7861657. The reversal of 7861631 is 1361687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1361687 = 359 ⋅3793.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7861631 is a prime.

It is a super-2 number, since 2×7861631² = 123610483960322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7861031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126770 + ... + 126831.

It is an arithmetic number, because the mean of its divisors is an integer number (2028816).

Almost surely, 2^7861631 is an apocalyptic number.

7861631 is a deficient number, since it is larger than the sum of its proper divisors (253633).

7861631 is a wasteful number, since it uses less digits than its factorization.

7861631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253632.

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

The square root of 7861631 is about 2803.8600179039. The cubic root of 7861631 is about 198.8402124647.

The spelling of 7861631 in words is "seven million, eight hundred sixty-one thousand, six hundred thirty-one".