1381341787 has 4 divisors (see below), whose sum is σ = 1578676336. Its totient is φ = 1184007240.

The previous prime is 1381341733. The next prime is 1381341791. The reversal of 1381341787 is 7871431831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1381341787 - 2²⁷ = 1247124059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381341887) 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, 98667264 + ... + 98667277.

It is an arithmetic number, because the mean of its divisors is an integer number (394669084).

Almost surely, 2^1381341787 is an apocalyptic number.

1381341787 is a deficient number, since it is larger than the sum of its proper divisors (197334549).

1381341787 is an equidigital number, since it uses as much as digits as its factorization.

1381341787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197334548.

The product of its digits is 112896, while the sum is 43.

The square root of 1381341787 is about 37166.4067001372. The cubic root of 1381341787 is about 1113.6970004209.

The spelling of 1381341787 in words is "one billion, three hundred eighty-one million, three hundred forty-one thousand, seven hundred eighty-seven".