801631 has 2 divisors, whose sum is σ = 801632. Its totient is φ = 801630.

The previous prime is 801617. The next prime is 801641. The reversal of 801631 is 136108.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 801631 - 2⁷ = 801503 is a prime.

It is a super-2 number, since 2×801631² = 1285224520322, which contains 22 as substring.

It is equal to p₆₄₀₈₁ and since 801631 and 64081 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 801599 and 801608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (801611) 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, 400815 + 400816.

It is an arithmetic number, because the mean of its divisors is an integer number (400816).

2⁸⁰¹⁶³¹ is an apocalyptic number.

801631 is a deficient number, since it is larger than the sum of its proper divisors (1).

801631 is an equidigital number, since it uses as much as digits as its factorization.

801631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 801631 is about 895.3384834799. The cubic root of 801631 is about 92.8948207762.

Adding to 801631 its reverse (136108), we get a palindrome (937739).

It can be divided in two parts, 80 and 1631, that added together give a triangular number (1711 = T₅₈).

The spelling of 801631 in words is "eight hundred one thousand, six hundred thirty-one".