1581132 has 36 divisors (see below), whose sum is σ = 4293240. Its totient is φ = 451584.

The previous prime is 1581131. The next prime is 1581157. The reversal of 1581132 is 2311851.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1581099 and 1581108.

It is not an unprimeable number, because it can be changed into a prime (1581131) 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, 757 + ... + 1932.

2^1581132 is an apocalyptic number.

1581132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1581132 is an abundant number, since it is smaller than the sum of its proper divisors (2712108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1581132 is a wasteful number, since it uses less digits than its factorization.

1581132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2710 (or 2701 counting only the distinct ones).

The product of its digits is 240, while the sum is 21.

The square root of 1581132 is about 1257.4307137970. The cubic root of 1581132 is about 116.4991373265.

Adding to 1581132 its reverse (2311851), we get a palindrome (3892983).

The spelling of 1581132 in words is "one million, five hundred eighty-one thousand, one hundred thirty-two".