997135807 has 2 divisors, whose sum is σ = 997135808. Its totient is φ = 997135806.

The previous prime is 997135787. The next prime is 997135819. The reversal of 997135807 is 708531799.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997135807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997135877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498567903 + 498567904.

It is an arithmetic number, because the mean of its divisors is an integer number (498567904).

Almost surely, 2^997135807 is an apocalyptic number.

997135807 is a deficient number, since it is larger than the sum of its proper divisors (1).

997135807 is an equidigital number, since it uses as much as digits as its factorization.

997135807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 476280, while the sum is 49.

The square root of 997135807 is about 31577.4572598872. The cubic root of 997135807 is about 999.0443560355.

The spelling of 997135807 in words is "nine hundred ninety-seven million, one hundred thirty-five thousand, eight hundred seven".