1581125 has 32 divisors (see below), whose sum is σ = 2446080. Its totient is φ = 993600.

The previous prime is 1581113. The next prime is 1581131. The reversal of 1581125 is 5211851.

It is not a de Polignac number, because 1581125 - 2⁶ = 1581061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1581125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11306 + ... + 11444.

It is an arithmetic number, because the mean of its divisors is an integer number (76440).

2^1581125 is an apocalyptic number.

It is an amenable number.

1581125 is a deficient number, since it is larger than the sum of its proper divisors (864955).

1581125 is a wasteful number, since it uses less digits than its factorization.

1581125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 164 counting only the distinct ones).

The product of its digits is 400, while the sum is 23.

The square root of 1581125 is about 1257.4279303403. The cubic root of 1581125 is about 116.4989654043.

Adding to 1581125 its reverse (5211851), we get a palindrome (6792976).

The spelling of 1581125 in words is "one million, five hundred eighty-one thousand, one hundred twenty-five".