997651357 has 2 divisors, whose sum is σ = 997651358. Its totient is φ = 997651356.

The previous prime is 997651351. The next prime is 997651397. The reversal of 997651357 is 753156799.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 610781796 + 386869561 = 24714^2 + 19669^2 .

It is an emirp because it is prime and its reverse (753156799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997651357 - 2¹⁹ = 997127069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997651351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498825678 + 498825679.

It is an arithmetic number, because the mean of its divisors is an integer number (498825679).

Almost surely, 2^997651357 is an apocalyptic number.

It is an amenable number.

997651357 is a deficient number, since it is larger than the sum of its proper divisors (1).

997651357 is an equidigital number, since it uses as much as digits as its factorization.

997651357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1786050, while the sum is 52.

The square root of 997651357 is about 31585.6194651933. The cubic root of 997651357 is about 999.2165052964.

The spelling of 997651357 in words is "nine hundred ninety-seven million, six hundred fifty-one thousand, three hundred fifty-seven".