1361808025 has 6 divisors (see below), whose sum is σ = 1688641982. Its totient is φ = 1089446400.

The previous prime is 1361807987. The next prime is 1361808043. The reversal of 1361808025 is 5208081631.

It can be written as a sum of positive squares in 3 ways, for example, as 474542656 + 887265369 = 21784^2 + 29787^2 .

It is not a de Polignac number, because 1361808025 - 2²⁵ = 1328253593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27236136 + ... + 27236185.

Almost surely, 2^1361808025 is an apocalyptic number.

It is an amenable number.

1361808025 is a deficient number, since it is larger than the sum of its proper divisors (326833957).

1361808025 is an equidigital number, since it uses as much as digits as its factorization.

1361808025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54472331 (or 54472326 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1361808025 is about 36902.6831680299. The cubic root of 1361808025 is about 1108.4224065196.

Adding to 1361808025 its reverse (5208081631), we get a palindrome (6569889656).

The spelling of 1361808025 in words is "one billion, three hundred sixty-one million, eight hundred eight thousand, twenty-five".