97891247 has 2 divisors, whose sum is σ = 97891248. Its totient is φ = 97891246.

The previous prime is 97891237. The next prime is 97891259. The reversal of 97891247 is 74219879.

It is a weak prime.

It is an emirp because it is prime and its reverse (74219879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97891247 - 2¹⁶ = 97825711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97891237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48945623 + 48945624.

It is an arithmetic number, because the mean of its divisors is an integer number (48945624).

Almost surely, 2^97891247 is an apocalyptic number.

97891247 is a deficient number, since it is larger than the sum of its proper divisors (1).

97891247 is an equidigital number, since it uses as much as digits as its factorization.

97891247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 47.

The square root of 97891247 is about 9894.0005558924. Note that the first 3 decimals coincide. The cubic root of 97891247 is about 460.8730222793.

The spelling of 97891247 in words is "ninety-seven million, eight hundred ninety-one thousand, two hundred forty-seven".