97891237 has 2 divisors, whose sum is σ = 97891238. Its totient is φ = 97891236.

The previous prime is 97891223. The next prime is 97891247. The reversal of 97891237 is 73219879.

It is a happy number.

It is a Cunningham number, because it is equal to 9894²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97891236 + 1 = 9894^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 97891237 - 2¹¹ = 97889189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97891247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48945618 + 48945619.

It is an arithmetic number, because the mean of its divisors is an integer number (48945619).

Almost surely, 2^97891237 is an apocalyptic number.

It is an amenable number.

97891237 is a deficient number, since it is larger than the sum of its proper divisors (1).

97891237 is an equidigital number, since it uses as much as digits as its factorization.

97891237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 46.

The square root of 97891237 is about 9894.0000505357. Note that the first 4 decimals coincide. The cubic root of 97891237 is about 460.8730065859.

It can be divided in two parts, 9789 and 1237, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 97891237 in words is "ninety-seven million, eight hundred ninety-one thousand, two hundred thirty-seven".