997659787 has 2 divisors, whose sum is σ = 997659788. Its totient is φ = 997659786.

The previous prime is 997659731. The next prime is 997659821. The reversal of 997659787 is 787956799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 997659787 - 2¹⁹ = 997135499 is a prime.

It is a super-3 number, since 3×997659787³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (997659287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498829893 + 498829894.

It is an arithmetic number, because the mean of its divisors is an integer number (498829894).

Almost surely, 2^997659787 is an apocalyptic number.

997659787 is a deficient number, since it is larger than the sum of its proper divisors (1).

997659787 is an equidigital number, since it uses as much as digits as its factorization.

997659787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60011280, while the sum is 67.

The square root of 997659787 is about 31585.7529117164. The cubic root of 997659787 is about 999.2193196969.

The spelling of 997659787 in words is "nine hundred ninety-seven million, six hundred fifty-nine thousand, seven hundred eighty-seven".