997913 has 4 divisors (see below), whose sum is σ = 1140480. Its totient is φ = 855348.

The previous prime is 997897. The next prime is 997933. The reversal of 997913 is 319799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 319799 = 83 ⋅3853.

It is a cyclic number.

It is not a de Polignac number, because 997913 - 2⁴ = 997897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 997913.

It is not an unprimeable number, because it can be changed into a prime (997933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71273 + ... + 71286.

It is an arithmetic number, because the mean of its divisors is an integer number (285120).

2⁹⁹⁷⁹¹³ is an apocalyptic number.

It is an amenable number.

997913 is a deficient number, since it is larger than the sum of its proper divisors (142567).

997913 is a wasteful number, since it uses less digits than its factorization.

997913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142566.

The product of its digits is 15309, while the sum is 38.

The square root of 997913 is about 998.9559549850. The cubic root of 997913 is about 99.9303848819.

It can be divided in two parts, 99 and 7913, that multiplied together give a palindrome (783387).

The spelling of 997913 in words is "nine hundred ninety-seven thousand, nine hundred thirteen".