1381247305 has 4 divisors (see below), whose sum is σ = 1657496772. Its totient is φ = 1104997840.

The previous prime is 1381247279. The next prime is 1381247323. The reversal of 1381247305 is 5037421831.

1381247305 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5037421831 = 13 ⋅387493987.

It can be written as a sum of positive squares in 2 ways, for example, as 438818704 + 942428601 = 20948^2 + 30699^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1381247305 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138124726 + ... + 138124735.

It is an arithmetic number, because the mean of its divisors is an integer number (414374193).

Almost surely, 2^1381247305 is an apocalyptic number.

It is an amenable number.

1381247305 is a deficient number, since it is larger than the sum of its proper divisors (276249467).

1381247305 is an equidigital number, since it uses as much as digits as its factorization.

1381247305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276249466.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1381247305 is about 37165.1356112150. The cubic root of 1381247305 is about 1113.6716080282.

The spelling of 1381247305 in words is "one billion, three hundred eighty-one million, two hundred forty-seven thousand, three hundred five".