1520204225 has 6 divisors (see below), whose sum is σ = 1885053270. Its totient is φ = 1216163360.

The previous prime is 1520204221. The next prime is 1520204239. The reversal of 1520204225 is 5224020251.

It can be written as a sum of positive squares in 3 ways, for example, as 24990001 + 1495214224 = 4999^2 + 38668^2 .

It is not a de Polignac number, because 1520204225 - 2² = 1520204221 is a prime.

It is a super-2 number, since 2×1520204225² = 4622041771415701250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1520204225.

It is not an unprimeable number, because it can be changed into a prime (1520204221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30404060 + ... + 30404109.

It is an arithmetic number, because the mean of its divisors is an integer number (314175545).

Almost surely, 2^1520204225 is an apocalyptic number.

It is an amenable number.

1520204225 is a deficient number, since it is larger than the sum of its proper divisors (364849045).

1520204225 is an equidigital number, since it uses as much as digits as its factorization.

1520204225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60808179 (or 60808174 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 1520204225 is about 38989.7964216281. The cubic root of 1520204225 is about 1149.8309077156.

Adding to 1520204225 its reverse (5224020251), we get a palindrome (6744224476).

The spelling of 1520204225 in words is "one billion, five hundred twenty million, two hundred four thousand, two hundred twenty-five".