1355565231 has 12 divisors (see below), whose sum is σ = 1966667352. Its totient is φ = 899727696.

The previous prime is 1355565223. The next prime is 1355565257. The reversal of 1355565231 is 1325655531.

1355565231 is a `hidden beast` number, since 13 + 55 + 565 + 2 + 31 = 666.

It is not a de Polignac number, because 1355565231 - 2³ = 1355565223 is a prime.

It is a super-2 number, since 2×1355565231² = 3675114190992166722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355565221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 329716 + ... + 333801.

It is an arithmetic number, because the mean of its divisors is an integer number (163888946).

Almost surely, 2^1355565231 is an apocalyptic number.

1355565231 is a deficient number, since it is larger than the sum of its proper divisors (611102121).

1355565231 is a wasteful number, since it uses less digits than its factorization.

1355565231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663750 (or 663747 counting only the distinct ones).

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

The square root of 1355565231 is about 36818.0014530936. The cubic root of 1355565231 is about 1106.7260701508.

The spelling of 1355565231 in words is "one billion, three hundred fifty-five million, five hundred sixty-five thousand, two hundred thirty-one".