91628417 has 2 divisors, whose sum is σ = 91628418. Its totient is φ = 91628416.

The previous prime is 91628363. The next prime is 91628479. The reversal of 91628417 is 71482619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75620416 + 16008001 = 8696^2 + 4001^2 .

It is a cyclic number.

It is not a de Polignac number, because 91628417 - 2⁶ = 91628353 is a prime.

It is a Chen prime.

It is equal to p_5305988 and since 91628417 and 5305988 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (91628617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45814208 + 45814209.

It is an arithmetic number, because the mean of its divisors is an integer number (45814209).

Almost surely, 2^91628417 is an apocalyptic number.

It is an amenable number.

91628417 is a deficient number, since it is larger than the sum of its proper divisors (1).

91628417 is an equidigital number, since it uses as much as digits as its factorization.

91628417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 91628417 is about 9572.2733454493. The cubic root of 91628417 is about 450.8271486387.

The spelling of 91628417 in words is "ninety-one million, six hundred twenty-eight thousand, four hundred seventeen".