1522170225 has 105 divisors (see below), whose sum is σ = 3006811303. Its totient is φ = 764069760.

The previous prime is 1522170217. The next prime is 1522170227. The reversal of 1522170225 is 5220712251.

The square root of 1522170225 is 39015.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 165868641 + 1356301584 = 12879^2 + 36828^2 .

It is not a de Polignac number, because 1522170225 - 2³ = 1522170217 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 not an unprimeable number, because it can be changed into a prime (1522170227) by changing a digit.

It is a polite number, since it can be written in 104 ways as a sum of consecutive naturals, for example, 89539417 + ... + 89539433.

Almost surely, 2^1522170225 is an apocalyptic number.

1522170225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1522170225 is the 39015-th square number.

1522170225 is the 19508-th centered octagonal number.

It is an amenable number.

1522170225 is a deficient number, since it is larger than the sum of its proper divisors (1484641078).

1522170225 is an frugal number, since it uses more digits than its factorization.

1522170225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 25 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The cubic root of 1522170225 is about 1150.3263660968.

Adding to 1522170225 its reverse (5220712251), we get a palindrome (6742882476).

The spelling of 1522170225 in words is "one billion, five hundred twenty-two million, one hundred seventy thousand, two hundred twenty-five".