1375081817 has 2 divisors, whose sum is σ = 1375081818. Its totient is φ = 1375081816.

The previous prime is 1375081811. The next prime is 1375081819. The reversal of 1375081817 is 7181805731.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1324159321 + 50922496 = 36389^2 + 7136^2 .

It is a cyclic number.

It is not a de Polignac number, because 1375081817 - 2¹⁰ = 1375080793 is a prime.

Together with 1375081819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1375081811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687540908 + 687540909.

It is an arithmetic number, because the mean of its divisors is an integer number (687540909).

Almost surely, 2^1375081817 is an apocalyptic number.

It is an amenable number.

1375081817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375081817 is an equidigital number, since it uses as much as digits as its factorization.

1375081817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47040, while the sum is 41.

The square root of 1375081817 is about 37082.0956392704. The cubic root of 1375081817 is about 1112.0121005295.

The spelling of 1375081817 in words is "one billion, three hundred seventy-five million, eighty-one thousand, eight hundred seventeen".