997155 has 12 divisors (see below), whose sum is σ = 1728480. Its totient is φ = 531792.

The previous prime is 997153. The next prime is 997163. The reversal of 997155 is 551799.

It is a happy number.

It is not a de Polignac number, because 997155 - 2¹ = 997153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (997151) 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, 11035 + ... + 11124.

It is an arithmetic number, because the mean of its divisors is an integer number (144040).

2⁹⁹⁷¹⁵⁵ is an apocalyptic number.

997155 is a deficient number, since it is larger than the sum of its proper divisors (731325).

997155 is a wasteful number, since it uses less digits than its factorization.

997155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22170 (or 22167 counting only the distinct ones).

The product of its digits is 14175, while the sum is 36.

The square root of 997155 is about 998.5764868051. The cubic root of 997155 is about 99.9050765906.

The spelling of 997155 in words is "nine hundred ninety-seven thousand, one hundred fifty-five".