97890911 has 2 divisors, whose sum is σ = 97890912. Its totient is φ = 97890910.

The previous prime is 97890893. The next prime is 97890959. The reversal of 97890911 is 11909879.

It is a weak prime.

It is an emirp because it is prime and its reverse (11909879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97890911 - 2⁶ = 97890847 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97890211) 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, 48945455 + 48945456.

It is an arithmetic number, because the mean of its divisors is an integer number (48945456).

Almost surely, 2^97890911 is an apocalyptic number.

97890911 is a deficient number, since it is larger than the sum of its proper divisors (1).

97890911 is an equidigital number, since it uses as much as digits as its factorization.

97890911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 97890911 is about 9893.9835758910. The cubic root of 97890911 is about 460.8724949815.

The spelling of 97890911 in words is "ninety-seven million, eight hundred ninety thousand, nine hundred eleven".