997860761 has 2 divisors, whose sum is σ = 997860762. Its totient is φ = 997860760.

The previous prime is 997860749. The next prime is 997860817. The reversal of 997860761 is 167068799.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 666620761 + 331240000 = 25819^2 + 18200^2 .

It is an emirp because it is prime and its reverse (167068799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997860761 - 2¹⁴ = 997844377 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (997860161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498930380 + 498930381.

It is an arithmetic number, because the mean of its divisors is an integer number (498930381).

Almost surely, 2^997860761 is an apocalyptic number.

It is an amenable number.

997860761 is a deficient number, since it is larger than the sum of its proper divisors (1).

997860761 is an equidigital number, since it uses as much as digits as its factorization.

997860761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 997860761 is about 31588.9341542256. The cubic root of 997860761 is about 999.2864112455.

The spelling of 997860761 in words is "nine hundred ninety-seven million, eight hundred sixty thousand, seven hundred sixty-one".