999997253 has 4 divisors (see below), whose sum is σ = 1000061868. Its totient is φ = 999932640.

The previous prime is 999997249. The next prime is 999997267. The reversal of 999997253 is 352799999.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 337346689 + 662650564 = 18367^2 + 25742^2 .

It is a cyclic number.

It is not a de Polignac number, because 999997253 - 2² = 999997249 is a prime.

It is a super-3 number, since 3×999997253³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999957253) 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 3 ways as a sum of consecutive naturals, for example, 6233 + ... + 45153.

It is an arithmetic number, because the mean of its divisors is an integer number (250015467).

Almost surely, 2^999997253 is an apocalyptic number.

It is an amenable number.

999997253 is a deficient number, since it is larger than the sum of its proper divisors (64615).

999997253 is a wasteful number, since it uses less digits than its factorization.

999997253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64614.

The product of its digits is 12400290, while the sum is 62.

The square root of 999997253 is about 31622.7331677703. The cubic root of 999997253 is about 999.9990843325. Note that the first 3 decimals are identical.

The spelling of 999997253 in words is "nine hundred ninety-nine million, nine hundred ninety-seven thousand, two hundred fifty-three".