1361291720 has 16 divisors (see below), whose sum is σ = 3062906460. Its totient is φ = 544516672.

The previous prime is 1361291699. The next prime is 1361291759. The reversal of 1361291720 is 271921631.

It can be written as a sum of positive squares in 2 ways, for example, as 1339706404 + 21585316 = 36602^2 + 4646^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17016107 + ... + 17016186.

Almost surely, 2^1361291720 is an apocalyptic number.

1361291720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1361291720 is an abundant number, since it is smaller than the sum of its proper divisors (1701614740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1361291720 is a wasteful number, since it uses less digits than its factorization.

1361291720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34032304 (or 34032300 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1361291720 is about 36895.6870108147. The cubic root of 1361291720 is about 1108.2823093451.

The spelling of 1361291720 in words is "one billion, three hundred sixty-one million, two hundred ninety-one thousand, seven hundred twenty".