145274809 has 9 divisors (see below), whose sum is σ = 154541037. Its totient is φ = 136536384.

The previous prime is 145274807. The next prime is 145274813. The reversal of 145274809 is 908472541.

The square root of 145274809 is 12053.

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 1946025 + 143328784 = 1395^2 + 11972^2 .

It is not a de Polignac number, because 145274809 - 2¹ = 145274807 is a prime.

It is a super-2 number, since 2×145274809² = 42209540259972962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145274807) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 204547 + ... + 205255.

Almost surely, 2^145274809 is an apocalyptic number.

145274809 is the 12053-rd square number.

145274809 is the 6027-th centered octagonal number.

It is an amenable number.

145274809 is a deficient number, since it is larger than the sum of its proper divisors (9266228).

145274809 is an frugal number, since it uses more digits than its factorization.

145274809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452 (or 726 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The cubic root of 145274809 is about 525.6904704948.

The spelling of 145274809 in words is "one hundred forty-five million, two hundred seventy-four thousand, eight hundred nine".