997144633 has 4 divisors (see below), whose sum is σ = 997215268. Its totient is φ = 997074000.

The previous prime is 997144607. The next prime is 997144637. The reversal of 997144633 is 336441799.

It is the 12892-nd star number.

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 711128889 + 286015744 = 26667^2 + 16912^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997144633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997144637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6066 + ... + 45067.

It is an arithmetic number, because the mean of its divisors is an integer number (249303817).

Almost surely, 2^997144633 is an apocalyptic number.

It is an amenable number.

997144633 is a deficient number, since it is larger than the sum of its proper divisors (70635).

997144633 is a wasteful number, since it uses less digits than its factorization.

997144633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70634.

The product of its digits is 489888, while the sum is 46.

The square root of 997144633 is about 31577.5970111723. The cubic root of 997144633 is about 999.0473036579.

The spelling of 997144633 in words is "nine hundred ninety-seven million, one hundred forty-four thousand, six hundred thirty-three".