801531 has 24 divisors (see below), whose sum is σ = 1244880. Its totient is φ = 495936.

The previous prime is 801517. The next prime is 801539. The reversal of 801531 is 135108.

It is a happy number.

It is not a de Polignac number, because 801531 - 2⁷ = 801403 is a prime.

It is a super-2 number, since 2×801531² = 1284903887922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (801539) 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 in 23 ways as a sum of consecutive naturals, for example, 9616 + ... + 9698.

It is an arithmetic number, because the mean of its divisors is an integer number (51870).

2⁸⁰¹⁵³¹ is an apocalyptic number.

801531 is a deficient number, since it is larger than the sum of its proper divisors (443349).

801531 is a wasteful number, since it uses less digits than its factorization.

801531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 801531 is about 895.2826369365. The cubic root of 801531 is about 92.8909578732.

Adding to 801531 its reverse (135108), we get a palindrome (936639).

The spelling of 801531 in words is "eight hundred one thousand, five hundred thirty-one".