1545669225 has 27 divisors (see below), whose sum is σ = 2769521989. Its totient is φ = 824042400.

The previous prime is 1545669211. The next prime is 1545669227. The reversal of 1545669225 is 5229665451.

The square root of 1545669225 is 39315.

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

It can be written as a sum of positive squares in 4 ways, for example, as 67420521 + 1478248704 = 8211^2 + 38448^2 .

It is not a de Polignac number, because 1545669225 - 2⁵ = 1545669193 is a prime.

It is a super-2 number, since 2×1545669225² = 4778186706224201250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1545669227) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 588415 + ... + 591035.

Almost surely, 2^1545669225 is an apocalyptic number.

1545669225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1545669225 is the 39315-th square number.

1545669225 is the 19658-th centered octagonal number.

It is an amenable number.

1545669225 is a deficient number, since it is larger than the sum of its proper divisors (1223852764).

1545669225 is an frugal number, since it uses more digits than its factorization.

1545669225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5258 (or 2629 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The cubic root of 1545669225 is about 1156.2156762151.

It can be divided in two parts, 15456 and 69225, that added together give a square (84681 = 291²).

The spelling of 1545669225 in words is "one billion, five hundred forty-five million, six hundred sixty-nine thousand, two hundred twenty-five".