1375278899 has 4 divisors (see below), whose sum is σ = 1375354464. Its totient is φ = 1375203336.

The previous prime is 1375278889. The next prime is 1375278907. The reversal of 1375278899 is 9988725731.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9988725731 = 599 ⋅16675669.

It is a cyclic number.

It is not a de Polignac number, because 1375278899 - 2²⁰ = 1374230323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1375278829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8054 + ... + 53060.

It is an arithmetic number, because the mean of its divisors is an integer number (343838616).

Almost surely, 2^1375278899 is an apocalyptic number.

1375278899 is a deficient number, since it is larger than the sum of its proper divisors (75565).

1375278899 is an equidigital number, since it uses as much as digits as its factorization.

1375278899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75564.

The product of its digits is 7620480, while the sum is 59.

The square root of 1375278899 is about 37084.7529181468. The cubic root of 1375278899 is about 1112.0652239381.

The spelling of 1375278899 in words is "one billion, three hundred seventy-five million, two hundred seventy-eight thousand, eight hundred ninety-nine".