997508723 has 2 divisors, whose sum is σ = 997508724. Its totient is φ = 997508722.

The previous prime is 997508717. The next prime is 997508773. The reversal of 997508723 is 327805799.

It is a happy number.

It is an a-pointer prime, because the next prime (997508773) can be obtained adding 997508723 to its sum of digits (50).

It is a weak prime.

It is an emirp because it is prime and its reverse (327805799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997508723 - 2¹⁰ = 997507699 is a prime.

It is a super-2 number, since 2×997508723² = 1990047304922181458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (997508773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498754361 + 498754362.

It is an arithmetic number, because the mean of its divisors is an integer number (498754362).

Almost surely, 2^997508723 is an apocalyptic number.

997508723 is a deficient number, since it is larger than the sum of its proper divisors (1).

997508723 is an equidigital number, since it uses as much as digits as its factorization.

997508723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 50.

The square root of 997508723 is about 31583.3614898731. The cubic root of 997508723 is about 999.1688837705.

The spelling of 997508723 in words is "nine hundred ninety-seven million, five hundred eight thousand, seven hundred twenty-three".