1565389225 has 27 divisors (see below), whose sum is σ = 1999942959. Its totient is φ = 1215436800.

The previous prime is 1565389219. The next prime is 1565389247. The reversal of 1565389225 is 5229835651.

The square root of 1565389225 is 39565.

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

It can be written as a sum of positive squares in 13 ways, for example, as 1508778649 + 56610576 = 38843^2 + 7524^2 .

It is not a de Polignac number, because 1565389225 - 2⁵ = 1565389193 is a prime.

It is a super-2 number, since 2×1565389225² = 4900886851492201250, which contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8110729 + ... + 8110921.

Almost surely, 2^1565389225 is an apocalyptic number.

1565389225 is the 39565-th square number.

1565389225 is the 19783-rd centered octagonal number.

It is an amenable number.

1565389225 is a deficient number, since it is larger than the sum of its proper divisors (434553734).

1565389225 is an frugal number, since it uses more digits than its factorization.

1565389225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 239 counting only the distinct ones).

The product of its digits is 648000, while the sum is 46.

The cubic root of 1565389225 is about 1161.1119997161. Note that the first 3 decimals are identical.

The spelling of 1565389225 in words is "one billion, five hundred sixty-five million, three hundred eighty-nine thousand, two hundred twenty-five".