1375564989 has 8 divisors (see below), whose sum is σ = 1847282080. Its totient is φ = 910445616.

The previous prime is 1375564963. The next prime is 1375564991. The reversal of 1375564989 is 9894655731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1375564989 - 2⁸ = 1375564733 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 (1375564919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1648942 + ... + 1649775.

It is an arithmetic number, because the mean of its divisors is an integer number (230910260).

Almost surely, 2^1375564989 is an apocalyptic number.

It is an amenable number.

1375564989 is a deficient number, since it is larger than the sum of its proper divisors (471717091).

1375564989 is a wasteful number, since it uses less digits than its factorization.

1375564989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3298859.

The product of its digits is 8164800, while the sum is 57.

The square root of 1375564989 is about 37088.6099631679. The cubic root of 1375564989 is about 1112.1423304028.

The spelling of 1375564989 in words is "one billion, three hundred seventy-five million, five hundred sixty-four thousand, nine hundred eighty-nine".