1375445569 has 3 divisors (see below), whose sum is σ = 1375482657. Its totient is φ = 1375408482.

The previous prime is 1375445551. The next prime is 1375445579. The reversal of 1375445569 is 9655445731.

The square root of 1375445569 is 37087.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1375445569 - 2¹⁷ = 1375314497 is a prime.

It is a super-2 number, since 2×1375445569² = 3783701026563467522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1375445509) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 18544 + ... + 55630.

It is an arithmetic number, because the mean of its divisors is an integer number (458494219).

Almost surely, 2^1375445569 is an apocalyptic number.

1375445569 is the 37087-th square number.

1375445569 is the 18544-th centered octagonal number.

It is an amenable number.

1375445569 is a deficient number, since it is larger than the sum of its proper divisors (37088).

1375445569 is an frugal number, since it uses more digits than its factorization.

1375445569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74174 (or 37087 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 49.

The cubic root of 1375445569 is about 1112.1101458382.

Multiplying 1375445569 by its sum of digits (49), we get a square (67396832881 = 259609²).

The spelling of 1375445569 in words is "one billion, three hundred seventy-five million, four hundred forty-five thousand, five hundred sixty-nine".