1375593921 has 45 divisors (see below), whose sum is σ = 2232169401. Its totient is φ = 843848928.

The previous prime is 1375593893. The next prime is 1375593929. The reversal of 1375593921 is 1293955731.

The square root of 1375593921 is 37089.

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

1375593921 is a `hidden beast` number, since 1 + 3 + 7 + 559 + 3 + 92 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 893352321 + 482241600 = 29889^2 + 21960^2 .

It is not a de Polignac number, because 1375593921 - 2⁵ = 1375593889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1375593929) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 4339255 + ... + 4339571.

Almost surely, 2^1375593921 is an apocalyptic number.

1375593921 is the 37089-th square number.

1375593921 is the 18545-th centered octagonal number.

It is an amenable number.

1375593921 is a deficient number, since it is larger than the sum of its proper divisors (856575480).

1375593921 is an frugal number, since it uses more digits than its factorization.

1375593921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 333 counting only the distinct ones).

The product of its digits is 255150, while the sum is 45.

The cubic root of 1375593921 is about 1112.1501275083.

The spelling of 1375593921 in words is "one billion, three hundred seventy-five million, five hundred ninety-three thousand, nine hundred twenty-one".