1815131 has 2 divisors, whose sum is σ = 1815132. Its totient is φ = 1815130.

The previous prime is 1815103. The next prime is 1815179. The reversal of 1815131 is 1315181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1815131 - 2¹⁰ = 1814107 is a prime.

It is a super-2 number, since 2×1815131² = 6589401094322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1815101) 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, 907565 + 907566.

It is an arithmetic number, because the mean of its divisors is an integer number (907566).

2^1815131 is an apocalyptic number.

1815131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1815131 is an equidigital number, since it uses as much as digits as its factorization.

1815131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 20.

The square root of 1815131 is about 1347.2679763135. The cubic root of 1815131 is about 121.9839403746.

The spelling of 1815131 in words is "one million, eight hundred fifteen thousand, one hundred thirty-one".