997751 has 2 divisors, whose sum is σ = 997752. Its totient is φ = 997750.

The previous prime is 997741. The next prime is 997769. The reversal of 997751 is 157799.

It is a weak prime.

It is an emirp because it is prime and its reverse (157799) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997751 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498875 + 498876.

It is an arithmetic number, because the mean of its divisors is an integer number (498876).

2⁹⁹⁷⁷⁵¹ is an apocalyptic number.

997751 is a deficient number, since it is larger than the sum of its proper divisors (1).

997751 is an equidigital number, since it uses as much as digits as its factorization.

997751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19845, while the sum is 38.

The square root of 997751 is about 998.8748670379. The cubic root of 997751 is about 99.9249770630.

The spelling of 997751 in words is "nine hundred ninety-seven thousand, seven hundred fifty-one".