997491 has 16 divisors (see below), whose sum is σ = 1467648. Its totient is φ = 597600.

The previous prime is 997463. The next prime is 997511. The reversal of 997491 is 194799.

It is not a de Polignac number, because 997491 - 2⁶ = 997427 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (997091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5421 + ... + 5601.

It is an arithmetic number, because the mean of its divisors is an integer number (91728).

2⁹⁹⁷⁴⁹¹ is an apocalyptic number.

997491 is a deficient number, since it is larger than the sum of its proper divisors (470157).

997491 is a wasteful number, since it uses less digits than its factorization.

997491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362.

The product of its digits is 20412, while the sum is 39.

The square root of 997491 is about 998.7447121262. The cubic root of 997491 is about 99.9162966237.

The spelling of 997491 in words is "nine hundred ninety-seven thousand, four hundred ninety-one".