971218973 has 2 divisors, whose sum is σ = 971218974. Its totient is φ = 971218972.

The previous prime is 971218943. The next prime is 971218987. The reversal of 971218973 is 379812179.

971218973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 917665849 + 53553124 = 30293^2 + 7318^2 .

It is a cyclic number.

It is not a de Polignac number, because 971218973 - 2⁶ = 971218909 is a prime.

It is equal to p_49457756 and since 971218973 and 49457756 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (971218943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485609486 + 485609487.

It is an arithmetic number, because the mean of its divisors is an integer number (485609487).

Almost surely, 2^971218973 is an apocalyptic number.

It is an amenable number.

971218973 is a deficient number, since it is larger than the sum of its proper divisors (1).

971218973 is an equidigital number, since it uses as much as digits as its factorization.

971218973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 47.

The square root of 971218973 is about 31164.3862926899. The cubic root of 971218973 is about 990.3127852262.

The spelling of 971218973 in words is "nine hundred seventy-one million, two hundred eighteen thousand, nine hundred seventy-three".