1309342390225 has 9 divisors (see below), whose sum is σ = 1623591658353. Its totient is φ = 1047469335120.

The previous prime is 1309342390177. The next prime is 1309342390231. The reversal of 1309342390225 is 5220932439031.

The square root of 1309342390225 is 1144265.

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 26070300369 + 1283272089856 = 161463^2 + 1132816^2 .

It is not a de Polignac number, because 1309342390225 - 2²¹ = 1309340293073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5606899 + ... + 5835751.

Almost surely, 2^{1309342390225} is an apocalyptic number.

1309342390225 is the 1144265-th square number.

1309342390225 is the 572133-rd centered octagonal number.

It is an amenable number.

1309342390225 is a deficient number, since it is larger than the sum of its proper divisors (314249268128).

1309342390225 is an frugal number, since it uses more digits than its factorization.

1309342390225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457716 (or 228858 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 43.

The spelling of 1309342390225 in words is "one trillion, three hundred nine billion, three hundred forty-two million, three hundred ninety thousand, two hundred twenty-five".