997251847 has 2 divisors, whose sum is σ = 997251848. Its totient is φ = 997251846.

The previous prime is 997251823. The next prime is 997251929. The reversal of 997251847 is 748152799.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997251847 is a prime.

It is a super-2 number, since 2×997251847² = 1989022492689822818, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 997251794 and 997251803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997251817) 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, 498625923 + 498625924.

It is an arithmetic number, because the mean of its divisors is an integer number (498625924).

Almost surely, 2^997251847 is an apocalyptic number.

997251847 is a deficient number, since it is larger than the sum of its proper divisors (1).

997251847 is an equidigital number, since it uses as much as digits as its factorization.

997251847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 52.

The square root of 997251847 is about 31579.2945931349. The cubic root of 997251847 is about 999.0831085670.

The spelling of 997251847 in words is "nine hundred ninety-seven million, two hundred fifty-one thousand, eight hundred forty-seven".