997251823 has 2 divisors, whose sum is σ = 997251824. Its totient is φ = 997251822.

The previous prime is 997251821. The next prime is 997251847. The reversal of 997251823 is 328152799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997251823 - 2¹ = 997251821 is a prime.

It is a super-2 number, since 2×997251823² = 1989022396953646658, which contains 22 as substring.

Together with 997251821, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997251821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498625911 + 498625912.

It is an arithmetic number, because the mean of its divisors is an integer number (498625912).

Almost surely, 2^997251823 is an apocalyptic number.

997251823 is a deficient number, since it is larger than the sum of its proper divisors (1).

997251823 is an equidigital number, since it uses as much as digits as its factorization.

997251823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 997251823 is about 31579.2942131391. The cubic root of 997251823 is about 999.0831005524.

The spelling of 997251823 in words is "nine hundred ninety-seven million, two hundred fifty-one thousand, eight hundred twenty-three".