1375278889 has 2 divisors, whose sum is σ = 1375278890. Its totient is φ = 1375278888.

The previous prime is 1375278841. The next prime is 1375278907. The reversal of 1375278889 is 9888725731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1029318889 + 345960000 = 32083^2 + 18600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1375278889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1375278829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687639444 + 687639445.

It is an arithmetic number, because the mean of its divisors is an integer number (687639445).

Almost surely, 2^1375278889 is an apocalyptic number.

It is an amenable number.

1375278889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375278889 is an equidigital number, since it uses as much as digits as its factorization.

1375278889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6773760, while the sum is 58.

The square root of 1375278889 is about 37084.7527833205. The cubic root of 1375278889 is about 1112.0652212427.

The spelling of 1375278889 in words is "one billion, three hundred seventy-five million, two hundred seventy-eight thousand, eight hundred eighty-nine".