997747151 has 2 divisors, whose sum is σ = 997747152. Its totient is φ = 997747150.

The previous prime is 997747129. The next prime is 997747213. The reversal of 997747151 is 151747799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997747151 - 2²⁶ = 930638287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 997747151.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997747651) 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, 498873575 + 498873576.

It is an arithmetic number, because the mean of its divisors is an integer number (498873576).

Almost surely, 2^997747151 is an apocalyptic number.

997747151 is a deficient number, since it is larger than the sum of its proper divisors (1).

997747151 is an equidigital number, since it uses as much as digits as its factorization.

997747151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 555660, while the sum is 50.

The square root of 997747151 is about 31587.1358467336. The cubic root of 997747151 is about 999.2484857011.

The spelling of 997747151 in words is "nine hundred ninety-seven million, seven hundred forty-seven thousand, one hundred fifty-one".