997522 has 4 divisors (see below), whose sum is σ = 1496286. Its totient is φ = 498760.

The previous prime is 997511. The next prime is 997541. The reversal of 997522 is 225799.

997522 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 225799 = 7 ⋅32257.

It can be written as a sum of positive squares in only one way, i.e., 919681 + 77841 = 959^2 + 279^2 .

It is a d-powerful number, because it can be written as 9⁵ + 9⁶ + 5⁸ + 7 + 2⁴ + 2¹⁴ .

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249379 + ... + 249382.

2⁹⁹⁷⁵²² is an apocalyptic number.

997522 is a deficient number, since it is larger than the sum of its proper divisors (498764).

997522 is a wasteful number, since it uses less digits than its factorization.

997522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498763.

The product of its digits is 11340, while the sum is 34.

The square root of 997522 is about 998.7602314870. The cubic root of 997522 is about 99.9173316783.

The spelling of 997522 in words is "nine hundred ninety-seven thousand, five hundred twenty-two".