91059861 has 4 divisors (see below), whose sum is σ = 121413152. Its totient is φ = 60706572.

The previous prime is 91059841. The next prime is 91059877. The reversal of 91059861 is 16895019.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 91059861 - 2¹⁸ = 90797717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91059841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15176641 + ... + 15176646.

It is an arithmetic number, because the mean of its divisors is an integer number (30353288).

Almost surely, 2^91059861 is an apocalyptic number.

It is an amenable number.

91059861 is a deficient number, since it is larger than the sum of its proper divisors (30353291).

91059861 is a wasteful number, since it uses less digits than its factorization.

91059861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30353290.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 91059861 is about 9542.5290672861. The cubic root of 91059861 is about 449.8927497493.

The spelling of 91059861 in words is "ninety-one million, fifty-nine thousand, eight hundred sixty-one".