997753391 has 2 divisors, whose sum is σ = 997753392. Its totient is φ = 997753390.

The previous prime is 997753297. The next prime is 997753397. The reversal of 997753391 is 193357799.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997753391 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997753397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498876695 + 498876696.

It is an arithmetic number, because the mean of its divisors is an integer number (498876696).

Almost surely, 2^997753391 is an apocalyptic number.

997753391 is a deficient number, since it is larger than the sum of its proper divisors (1).

997753391 is an equidigital number, since it uses as much as digits as its factorization.

997753391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1607445, while the sum is 53.

The square root of 997753391 is about 31587.2346209667. The cubic root of 997753391 is about 999.2505688266.

The spelling of 997753391 in words is "nine hundred ninety-seven million, seven hundred fifty-three thousand, three hundred ninety-one".