997443241 has 2 divisors, whose sum is σ = 997443242. Its totient is φ = 997443240.

The previous prime is 997443233. The next prime is 997443253. The reversal of 997443241 is 142344799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 884467600 + 112975641 = 29740^2 + 10629^2 .

It is an emirp because it is prime and its reverse (142344799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997443241 - 2³ = 997443233 is a prime.

It is not a weakly prime, because it can be changed into another prime (997443211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498721620 + 498721621.

It is an arithmetic number, because the mean of its divisors is an integer number (498721621).

Almost surely, 2^997443241 is an apocalyptic number.

It is an amenable number.

997443241 is a deficient number, since it is larger than the sum of its proper divisors (1).

997443241 is an equidigital number, since it uses as much as digits as its factorization.

997443241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The square root of 997443241 is about 31582.3248194303. The cubic root of 997443241 is about 999.1470196314.

The spelling of 997443241 in words is "nine hundred ninety-seven million, four hundred forty-three thousand, two hundred forty-one".