1321686025 has 27 divisors (see below), whose sum is σ = 1804154709. Its totient is φ = 959772000.

The previous prime is 1321686017. The next prime is 1321686031. The reversal of 1321686025 is 5206861231.

The square root of 1321686025 is 36355.

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 38900169 + 1282785856 = 6237^2 + 35816^2 .

It is not a de Polignac number, because 1321686025 - 2³ = 1321686017 is a prime.

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, 1999195 + ... + 1999855.

Almost surely, 2^1321686025 is an apocalyptic number.

1321686025 is the 36355-th square number.

1321686025 is the 18178-th centered octagonal number.

It is an amenable number.

1321686025 is a deficient number, since it is larger than the sum of its proper divisors (482468684).

1321686025 is an frugal number, since it uses more digits than its factorization.

1321686025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354 (or 677 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The cubic root of 1321686025 is about 1097.4281582895.

The spelling of 1321686025 in words is "one billion, three hundred twenty-one million, six hundred eighty-six thousand, twenty-five".