997859263 has 2 divisors, whose sum is σ = 997859264. Its totient is φ = 997859262.

The previous prime is 997859243. The next prime is 997859311. The reversal of 997859263 is 362958799.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997859263 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 997859198 and 997859207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997859243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498929631 + 498929632.

It is an arithmetic number, because the mean of its divisors is an integer number (498929632).

Almost surely, 2^997859263 is an apocalyptic number.

997859263 is a deficient number, since it is larger than the sum of its proper divisors (1).

997859263 is an equidigital number, since it uses as much as digits as its factorization.

997859263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7348320, while the sum is 58.

The square root of 997859263 is about 31588.9104433819. The cubic root of 997859263 is about 999.2859111986.

The spelling of 997859263 in words is "nine hundred ninety-seven million, eight hundred fifty-nine thousand, two hundred sixty-three".