997251377 has 2 divisors, whose sum is σ = 997251378. Its totient is φ = 997251376.

The previous prime is 997251349. The next prime is 997251379. The reversal of 997251377 is 773152799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 902461681 + 94789696 = 30041^2 + 9736^2 .

It is a cyclic number.

It is not a de Polignac number, because 997251377 - 2¹⁴ = 997234993 is a prime.

It is a super-2 number, since 2×997251377² = 1989020617856792258, which contains 22 as substring.

Together with 997251379, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (997251379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498625688 + 498625689.

It is an arithmetic number, because the mean of its divisors is an integer number (498625689).

Almost surely, 2^997251377 is an apocalyptic number.

It is an amenable number.

997251377 is a deficient number, since it is larger than the sum of its proper divisors (1).

997251377 is an equidigital number, since it uses as much as digits as its factorization.

997251377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 833490, while the sum is 50.

The square root of 997251377 is about 31579.2871515492. The cubic root of 997251377 is about 999.0829516127.

The spelling of 997251377 in words is "nine hundred ninety-seven million, two hundred fifty-one thousand, three hundred seventy-seven".