867631 has 2 divisors, whose sum is σ = 867632. Its totient is φ = 867630.

The previous prime is 867623. The next prime is 867641. The reversal of 867631 is 136768.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 867631 - 2³ = 867623 is a prime.

It is a super-2 number, since 2×867631² = 1505567104322, which contains 22 as substring.

It is an Ulam number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 867593 and 867602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (867641) 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, 433815 + 433816.

It is an arithmetic number, because the mean of its divisors is an integer number (433816).

2⁸⁶⁷⁶³¹ is an apocalyptic number.

867631 is a deficient number, since it is larger than the sum of its proper divisors (1).

867631 is an equidigital number, since it uses as much as digits as its factorization.

867631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 867631 is about 931.4671223398. The cubic root of 867631 is about 95.3772991767.

The spelling of 867631 in words is "eight hundred sixty-seven thousand, six hundred thirty-one".