1531881 has 12 divisors (see below), whose sum is σ = 2383108. Its totient is φ = 942624.

The previous prime is 1531861. The next prime is 1531897. The reversal of 1531881 is 1881351.

It can be written as a sum of positive squares in 2 ways, for example, as 826281 + 705600 = 909^2 + 840^2 .

It is not a de Polignac number, because 1531881 - 2¹⁷ = 1400809 is a prime.

It is a super-2 number, since 2×1531881² = 4693318796322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1531811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6430 + ... + 6663.

2^1531881 is an apocalyptic number.

It is an amenable number.

1531881 is a deficient number, since it is larger than the sum of its proper divisors (851227).

1531881 is a wasteful number, since it uses less digits than its factorization.

1531881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13112 (or 13109 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 1531881 is about 1237.6918033178. The cubic root of 1531881 is about 115.2767374282.

The spelling of 1531881 in words is "one million, five hundred thirty-one thousand, eight hundred eighty-one".