1525520223 has 12 divisors (see below), whose sum is σ = 2285141768. Its totient is φ = 1017013320.

The previous prime is 1525520209. The next prime is 1525520231. The reversal of 1525520223 is 3220255251.

It is not a de Polignac number, because 1525520223 - 2¹³ = 1525512031 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1525510223) 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, 3138688 + ... + 3139173.

Almost surely, 2^1525520223 is an apocalyptic number.

1525520223 is a deficient number, since it is larger than the sum of its proper divisors (759621545).

1525520223 is an frugal number, since it uses more digits than its factorization.

1525520223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6277876 (or 6277864 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 1525520223 is about 39057.9085845620. The cubic root of 1525520223 is about 1151.1696286559.

Adding to 1525520223 its reverse (3220255251), we get a palindrome (4745775474).

The spelling of 1525520223 in words is "one billion, five hundred twenty-five million, five hundred twenty thousand, two hundred twenty-three".