1381155812 has 6 divisors (see below), whose sum is σ = 2417022678. Its totient is φ = 690577904.

The previous prime is 1381155793. The next prime is 1381155859. The reversal of 1381155812 is 2185511831.

It can be written as a sum of positive squares in only one way, i.e., 1358364736 + 22791076 = 36856^2 + 4774^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172644473 + ... + 172644480.

It is an arithmetic number, because the mean of its divisors is an integer number (402837113).

Almost surely, 2^1381155812 is an apocalyptic number.

It is an amenable number.

1381155812 is a deficient number, since it is larger than the sum of its proper divisors (1035866866).

1381155812 is a wasteful number, since it uses less digits than its factorization.

1381155812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345288957 (or 345288955 counting only the distinct ones).

The product of its digits is 9600, while the sum is 35.

The square root of 1381155812 is about 37163.9046925912. The cubic root of 1381155812 is about 1113.6470178370.

The spelling of 1381155812 in words is "one billion, three hundred eighty-one million, one hundred fifty-five thousand, eight hundred twelve".