1531131 has 8 divisors (see below), whose sum is σ = 2333184. Its totient is φ = 874920.

The previous prime is 1531129. The next prime is 1531147. The reversal of 1531131 is 1311351.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1531131 - 2¹ = 1531129 is a prime.

It is a super-2 number, since 2×1531131² = 4688724278322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1531131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36435 + ... + 36476.

It is an arithmetic number, because the mean of its divisors is an integer number (291648).

2^1531131 is an apocalyptic number.

1531131 is a deficient number, since it is larger than the sum of its proper divisors (802053).

1531131 is an equidigital number, since it uses as much as digits as its factorization.

1531131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72921.

The product of its digits is 45, while the sum is 15.

The square root of 1531131 is about 1237.3887828811. The cubic root of 1531131 is about 115.2579214178.

Adding to 1531131 its reverse (1311351), we get a palindrome (2842482).

The spelling of 1531131 in words is "one million, five hundred thirty-one thousand, one hundred thirty-one".