1381204891 has 8 divisors (see below), whose sum is σ = 1508641200. Its totient is φ = 1254080640.

The previous prime is 1381204889. The next prime is 1381204897. The reversal of 1381204891 is 1984021831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1381204891 - 2¹ = 1381204889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1381204891.

It is not an unprimeable number, because it can be changed into a prime (1381204897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68706 + ... + 86503.

It is an arithmetic number, because the mean of its divisors is an integer number (188580150).

Almost surely, 2^1381204891 is an apocalyptic number.

1381204891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1381204891 is a deficient number, since it is larger than the sum of its proper divisors (127436309).

1381204891 is a wasteful number, since it uses less digits than its factorization.

1381204891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156029.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1381204891 is about 37164.5649914001. The cubic root of 1381204891 is about 1113.6602087297.

The spelling of 1381204891 in words is "one billion, three hundred eighty-one million, two hundred four thousand, eight hundred ninety-one".