997351757 has 2 divisors, whose sum is σ = 997351758. Its totient is φ = 997351756.

The previous prime is 997351741. The next prime is 997351759. The reversal of 997351757 is 757153799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 996917476 + 434281 = 31574^2 + 659^2 .

It is a cyclic number.

It is not a de Polignac number, because 997351757 - 2⁴ = 997351741 is a prime.

Together with 997351759, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 997351699 and 997351708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997351759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498675878 + 498675879.

It is an arithmetic number, because the mean of its divisors is an integer number (498675879).

Almost surely, 2^997351757 is an apocalyptic number.

It is an amenable number.

997351757 is a deficient number, since it is larger than the sum of its proper divisors (1).

997351757 is an equidigital number, since it uses as much as digits as its factorization.

997351757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2083725, while the sum is 53.

The square root of 997351757 is about 31580.8764444561. The cubic root of 997351757 is about 999.1164719414.

The spelling of 997351757 in words is "nine hundred ninety-seven million, three hundred fifty-one thousand, seven hundred fifty-seven".