1381525 has 12 divisors (see below), whose sum is σ = 1738852. Its totient is φ = 1088640.

The previous prime is 1381519. The next prime is 1381529. The reversal of 1381525 is 5251831.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3249 + 1378276 = 57^2 + 1174^2 .

It is not a de Polignac number, because 1381525 - 2³ = 1381517 is a prime.

It is a super-2 number, since 2×1381525² = 3817222651250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1381525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381529) 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, 1447 + ... + 2203.

2^1381525 is an apocalyptic number.

It is an amenable number.

1381525 is a deficient number, since it is larger than the sum of its proper divisors (357327).

1381525 is an equidigital number, since it uses as much as digits as its factorization.

1381525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840 (or 835 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

The square root of 1381525 is about 1175.3829163298. The cubic root of 1381525 is about 111.3746236304.

The spelling of 1381525 in words is "one million, three hundred eighty-one thousand, five hundred twenty-five".