91470647 has 2 divisors, whose sum is σ = 91470648. Its totient is φ = 91470646.

The previous prime is 91470641. The next prime is 91470671. The reversal of 91470647 is 74607419.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91470647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91470647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91470641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45735323 + 45735324.

It is an arithmetic number, because the mean of its divisors is an integer number (45735324).

Almost surely, 2^91470647 is an apocalyptic number.

91470647 is a deficient number, since it is larger than the sum of its proper divisors (1).

91470647 is an equidigital number, since it uses as much as digits as its factorization.

91470647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 91470647 is about 9564.0288058956. The cubic root of 91470647 is about 450.5682483837.

The spelling of 91470647 in words is "ninety-one million, four hundred seventy thousand, six hundred forty-seven".