1375121399 has 2 divisors, whose sum is σ = 1375121400. Its totient is φ = 1375121398.

The previous prime is 1375121389. The next prime is 1375121443. The reversal of 1375121399 is 9931215731.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1375121399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1375121369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687560699 + 687560700.

It is an arithmetic number, because the mean of its divisors is an integer number (687560700).

Almost surely, 2^1375121399 is an apocalyptic number.

1375121399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375121399 is an equidigital number, since it uses as much as digits as its factorization.

1375121399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51030, while the sum is 41.

The square root of 1375121399 is about 37082.6293431305. The cubic root of 1375121399 is about 1112.0227702560.

The spelling of 1375121399 in words is "one billion, three hundred seventy-five million, one hundred twenty-one thousand, three hundred ninety-nine".