1331552565 has 48 divisors (see below), whose sum is σ = 2642390400. Its totient is φ = 607637376.

The previous prime is 1331552479. The next prime is 1331552567. The reversal of 1331552565 is 5652551331.

1331552565 is a `hidden beast` number, since 1 + 33 + 15 + 52 + 565 = 666.

It is not a de Polignac number, because 1331552565 - 2⁷ = 1331552437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331552567) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 191571 + ... + 198399.

It is an arithmetic number, because the mean of its divisors is an integer number (55049800).

Almost surely, 2^1331552565 is an apocalyptic number.

1331552565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1331552565 is a deficient number, since it is larger than the sum of its proper divisors (1310837835).

1331552565 is a wasteful number, since it uses less digits than its factorization.

1331552565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7466 (or 7463 counting only the distinct ones).

The product of its digits is 67500, while the sum is 36.

The square root of 1331552565 is about 36490.4448451920. Note that the first 3 decimals coincide. The cubic root of 1331552565 is about 1100.1522007030.

The spelling of 1331552565 in words is "one billion, three hundred thirty-one million, five hundred fifty-two thousand, five hundred sixty-five".