1597131855 has 24 divisors (see below), whose sum is σ = 3020032080. Its totient is φ = 774366720.

The previous prime is 1597131787. The next prime is 1597131857. The reversal of 1597131855 is 5581317951.

1597131855 is a `hidden beast` number, since 1 + 597 + 1 + 3 + 1 + 8 + 55 = 666.

It is not a de Polignac number, because 1597131855 - 2⁷ = 1597131727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1597131855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1597131857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1612770 + ... + 1613759.

It is an arithmetic number, because the mean of its divisors is an integer number (125834670).

Almost surely, 2^1597131855 is an apocalyptic number.

1597131855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1597131855 is a deficient number, since it is larger than the sum of its proper divisors (1422900225).

1597131855 is a wasteful number, since it uses less digits than its factorization.

1597131855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3226551 (or 3226548 counting only the distinct ones).

The product of its digits is 189000, while the sum is 45.

The square root of 1597131855 is about 39964.1321061774. The cubic root of 1597131855 is about 1168.9078016982.

The spelling of 1597131855 in words is "one billion, five hundred ninety-seven million, one hundred thirty-one thousand, eight hundred fifty-five".