997133555 has 32 divisors (see below), whose sum is σ = 1388456640. Its totient is φ = 679403520.

The previous prime is 997133551. The next prime is 997133561. The reversal of 997133555 is 555331799.

It is not a de Polignac number, because 997133555 - 2² = 997133551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (997133551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211787 + ... + 216443.

It is an arithmetic number, because the mean of its divisors is an integer number (43389270).

Almost surely, 2^997133555 is an apocalyptic number.

997133555 is a deficient number, since it is larger than the sum of its proper divisors (391323085).

997133555 is a wasteful number, since it uses less digits than its factorization.

997133555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4919.

The product of its digits is 637875, while the sum is 47.

The square root of 997133555 is about 31577.4216015178. The cubic root of 997133555 is about 999.0436039315.

The spelling of 997133555 in words is "nine hundred ninety-seven million, one hundred thirty-three thousand, five hundred fifty-five".