1375391761 has 2 divisors, whose sum is σ = 1375391762. Its totient is φ = 1375391760.

The previous prime is 1375391723. The next prime is 1375391767. The reversal of 1375391761 is 1671935731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1373814225 + 1577536 = 37065^2 + 1256^2 .

It is an emirp because it is prime and its reverse (1671935731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1375391761 - 2¹⁵ = 1375358993 is a prime.

It is a super-2 number, since 2×1375391761² = 3783404992453362242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1375391767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687695880 + 687695881.

It is an arithmetic number, because the mean of its divisors is an integer number (687695881).

Almost surely, 2^1375391761 is an apocalyptic number.

It is an amenable number.

1375391761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375391761 is an equidigital number, since it uses as much as digits as its factorization.

1375391761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 119070, while the sum is 43.

The square root of 1375391761 is about 37086.2745635093. The cubic root of 1375391761 is about 1112.0956435793.

The spelling of 1375391761 in words is "one billion, three hundred seventy-five million, three hundred ninety-one thousand, seven hundred sixty-one".