997447039 has 2 divisors, whose sum is σ = 997447040. Its totient is φ = 997447038.

The previous prime is 997447021. The next prime is 997447043. The reversal of 997447039 is 930744799.

It is a strong prime.

It is an emirp because it is prime and its reverse (930744799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997447039 - 2²³ = 989058431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997447639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498723519 + 498723520.

It is an arithmetic number, because the mean of its divisors is an integer number (498723520).

Almost surely, 2^997447039 is an apocalyptic number.

997447039 is a deficient number, since it is larger than the sum of its proper divisors (1).

997447039 is an equidigital number, since it uses as much as digits as its factorization.

997447039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1714608, while the sum is 52.

The square root of 997447039 is about 31582.3849479421. The cubic root of 997447039 is about 999.1482877923.

The spelling of 997447039 in words is "nine hundred ninety-seven million, four hundred forty-seven thousand, thirty-nine".