997943461 has 2 divisors, whose sum is σ = 997943462. Its totient is φ = 997943460.

The previous prime is 997943431. The next prime is 997943477. The reversal of 997943461 is 164349799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 645668100 + 352275361 = 25410^2 + 18769^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997943461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 997943399 and 997943408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997943431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498971730 + 498971731.

It is an arithmetic number, because the mean of its divisors is an integer number (498971731).

Almost surely, 2^997943461 is an apocalyptic number.

It is an amenable number.

997943461 is a deficient number, since it is larger than the sum of its proper divisors (1).

997943461 is an equidigital number, since it uses as much as digits as its factorization.

997943461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 52.

The square root of 997943461 is about 31590.2431298020. The cubic root of 997943461 is about 999.3140165343.

The spelling of 997943461 in words is "nine hundred ninety-seven million, nine hundred forty-three thousand, four hundred sixty-one".