997297139 has 2 divisors, whose sum is σ = 997297140. Its totient is φ = 997297138.

The previous prime is 997297123. The next prime is 997297159. The reversal of 997297139 is 931792799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997297139 - 2⁴ = 997297123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (997297109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498648569 + 498648570.

It is an arithmetic number, because the mean of its divisors is an integer number (498648570).

Almost surely, 2^997297139 is an apocalyptic number.

997297139 is a deficient number, since it is larger than the sum of its proper divisors (1).

997297139 is an equidigital number, since it uses as much as digits as its factorization.

997297139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1928934, while the sum is 56.

The square root of 997297139 is about 31580.0117004412. The cubic root of 997297139 is about 999.0982333948.

The spelling of 997297139 in words is "nine hundred ninety-seven million, two hundred ninety-seven thousand, one hundred thirty-nine".