91000667 has 2 divisors, whose sum is σ = 91000668. Its totient is φ = 91000666.

The previous prime is 91000661. The next prime is 91000669. The reversal of 91000667 is 76600019.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (76600019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91000667 - 2¹² = 90996571 is a prime.

It is a super-2 number, since 2×91000667² = 16562242788889778, which contains 22 as substring.

Together with 91000669, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91000661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500333 + 45500334.

It is an arithmetic number, because the mean of its divisors is an integer number (45500334).

Almost surely, 2^91000667 is an apocalyptic number.

91000667 is a deficient number, since it is larger than the sum of its proper divisors (1).

91000667 is an equidigital number, since it uses as much as digits as its factorization.

91000667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 91000667 is about 9539.4269744047. The cubic root of 91000667 is about 449.7952434725.

The spelling of 91000667 in words is "ninety-one million, six hundred sixty-seven", and thus it is an aban number.