1375349491 has 2 divisors, whose sum is σ = 1375349492. Its totient is φ = 1375349490.

The previous prime is 1375349477. The next prime is 1375349509. The reversal of 1375349491 is 1949435731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1375349491 - 2⁹ = 1375348979 is a prime.

It is a super-3 number, since 3×1375349491³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1375349191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687674745 + 687674746.

It is an arithmetic number, because the mean of its divisors is an integer number (687674746).

Almost surely, 2^1375349491 is an apocalyptic number.

1375349491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375349491 is an equidigital number, since it uses as much as digits as its factorization.

1375349491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 46.

The square root of 1375349491 is about 37085.7046717465. The cubic root of 1375349491 is about 1112.0842507612.

The spelling of 1375349491 in words is "one billion, three hundred seventy-five million, three hundred forty-nine thousand, four hundred ninety-one".