1381312507 has 4 divisors (see below), whose sum is σ = 1385725960. Its totient is φ = 1376899056.

The previous prime is 1381312489. The next prime is 1381312511. The reversal of 1381312507 is 7052131831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7052131831 = 3631 ⋅1942201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381312507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381312547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2206257 + ... + 2206882.

It is an arithmetic number, because the mean of its divisors is an integer number (346431490).

Almost surely, 2^1381312507 is an apocalyptic number.

1381312507 is a deficient number, since it is larger than the sum of its proper divisors (4413453).

1381312507 is an equidigital number, since it uses as much as digits as its factorization.

1381312507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4413452.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1381312507 is about 37166.0127939493. The cubic root of 1381312507 is about 1113.6891314346.

The spelling of 1381312507 in words is "one billion, three hundred eighty-one million, three hundred twelve thousand, five hundred seven".