91417247 has 4 divisors (see below), whose sum is σ = 91578480. Its totient is φ = 91256016.

The previous prime is 91417241. The next prime is 91417253. The reversal of 91417247 is 74271419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74271419 = 17 ⋅4368907.

It is an interprime number because it is at equal distance from previous prime (91417241) and next prime (91417253).

It is a cyclic number.

It is not a de Polignac number, because 91417247 - 2⁴ = 91417231 is a prime.

It is a super-2 number, since 2×91417247² = 16714226098118018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91417241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79763 + ... + 80900.

It is an arithmetic number, because the mean of its divisors is an integer number (22894620).

Almost surely, 2^91417247 is an apocalyptic number.

91417247 is a deficient number, since it is larger than the sum of its proper divisors (161233).

91417247 is a wasteful number, since it uses less digits than its factorization.

91417247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161232.

The product of its digits is 14112, while the sum is 35.

The square root of 91417247 is about 9561.2366877931. The cubic root of 91417247 is about 450.4805516604.

The spelling of 91417247 in words is "ninety-one million, four hundred seventeen thousand, two hundred forty-seven".