97814891 has 2 divisors, whose sum is σ = 97814892. Its totient is φ = 97814890.

The previous prime is 97814879. The next prime is 97814921. The reversal of 97814891 is 19841879.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97814891 - 2²² = 93620587 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97814851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48907445 + 48907446.

It is an arithmetic number, because the mean of its divisors is an integer number (48907446).

Almost surely, 2^97814891 is an apocalyptic number.

97814891 is a deficient number, since it is larger than the sum of its proper divisors (1).

97814891 is an equidigital number, since it uses as much as digits as its factorization.

97814891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 47.

The square root of 97814891 is about 9890.1411011168. The cubic root of 97814891 is about 460.7531628259.

It can be divided in two parts, 9781 and 4891, that multiplied together give a triangular number (47838871 = T₉₇₈₁).

The spelling of 97814891 in words is "ninety-seven million, eight hundred fourteen thousand, eight hundred ninety-one".