1391144875 has 8 divisors (see below), whose sum is σ = 1736148960. Its totient is φ = 1112915800.

The previous prime is 1391144863. The next prime is 1391144879. The reversal of 1391144875 is 5784411931.

It is a happy number.

It is not a de Polignac number, because 1391144875 - 2²⁹ = 854273963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1391144879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5564455 + ... + 5564704.

It is an arithmetic number, because the mean of its divisors is an integer number (217018620).

Almost surely, 2^1391144875 is an apocalyptic number.

1391144875 is a deficient number, since it is larger than the sum of its proper divisors (345004085).

1391144875 is an equidigital number, since it uses as much as digits as its factorization.

1391144875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11129174 (or 11129164 counting only the distinct ones).

The product of its digits is 120960, while the sum is 43.

The square root of 1391144875 is about 37298.0545739319. The cubic root of 1391144875 is about 1116.3253492623.

The spelling of 1391144875 in words is "one billion, three hundred ninety-one million, one hundred forty-four thousand, eight hundred seventy-five".