1375488997 has 4 divisors (see below), whose sum is σ = 1387661580. Its totient is φ = 1363316416.

The previous prime is 1375488979. The next prime is 1375489001. The reversal of 1375488997 is 7998845731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7998845731 = 179 ⋅44686289.

It can be written as a sum of positive squares in 2 ways, for example, as 384120801 + 991368196 = 19599^2 + 31486^2 .

It is a cyclic number.

It is not a de Polignac number, because 1375488997 - 2²³ = 1367100389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1375488967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6086122 + ... + 6086347.

It is an arithmetic number, because the mean of its divisors is an integer number (346915395).

Almost surely, 2^1375488997 is an apocalyptic number.

It is an amenable number.

1375488997 is a deficient number, since it is larger than the sum of its proper divisors (12172583).

1375488997 is a wasteful number, since it uses less digits than its factorization.

1375488997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12172582.

The product of its digits is 15240960, while the sum is 61.

The square root of 1375488997 is about 37087.5854835550. The cubic root of 1375488997 is about 1112.1218502178.

The spelling of 1375488997 in words is "one billion, three hundred seventy-five million, four hundred eighty-eight thousand, nine hundred ninety-seven".