91370197 has 2 divisors, whose sum is σ = 91370198. Its totient is φ = 91370196.

The previous prime is 91370179. The next prime is 91370243. The reversal of 91370197 is 79107319.

Together with previous prime (91370179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83338641 + 8031556 = 9129^2 + 2834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91370197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91370177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45685098 + 45685099.

It is an arithmetic number, because the mean of its divisors is an integer number (45685099).

Almost surely, 2^91370197 is an apocalyptic number.

It is an amenable number.

91370197 is a deficient number, since it is larger than the sum of its proper divisors (1).

91370197 is an equidigital number, since it uses as much as digits as its factorization.

91370197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11907, while the sum is 37.

The square root of 91370197 is about 9558.7759153565. The cubic root of 91370197 is about 450.4032549872.

The spelling of 91370197 in words is "ninety-one million, three hundred seventy thousand, one hundred ninety-seven".