91589951 has 2 divisors, whose sum is σ = 91589952. Its totient is φ = 91589950.

The previous prime is 91589947. The next prime is 91589959. The reversal of 91589951 is 15998519.

It is a weak prime.

It is an emirp because it is prime and its reverse (15998519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91589951 - 2² = 91589947 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 91589896 and 91589905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91589959) 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 as a sum of consecutive naturals, namely, 45794975 + 45794976.

It is an arithmetic number, because the mean of its divisors is an integer number (45794976).

Almost surely, 2^91589951 is an apocalyptic number.

91589951 is a deficient number, since it is larger than the sum of its proper divisors (1).

91589951 is an equidigital number, since it uses as much as digits as its factorization.

91589951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 47.

The square root of 91589951 is about 9570.2638939582. The cubic root of 91589951 is about 450.7640534225.

The spelling of 91589951 in words is "ninety-one million, five hundred eighty-nine thousand, nine hundred fifty-one".