1525813 has 4 divisors (see below), whose sum is σ = 1528288. Its totient is φ = 1523340.

The previous prime is 1525787. The next prime is 1525819. The reversal of 1525813 is 3185251.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1525813 - 2⁵ = 1525781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1525819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520 + ... + 1822.

It is an arithmetic number, because the mean of its divisors is an integer number (382072).

2^1525813 is an apocalyptic number.

It is an amenable number.

1525813 is a deficient number, since it is larger than the sum of its proper divisors (2475).

1525813 is a wasteful number, since it uses less digits than its factorization.

1525813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474.

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

The square root of 1525813 is about 1235.2380337409. The cubic root of 1525813 is about 115.1243267892.

The spelling of 1525813 in words is "one million, five hundred twenty-five thousand, eight hundred thirteen".