91442493 has 8 divisors (see below), whose sum is σ = 135470400. Its totient is φ = 60961644.

The previous prime is 91442489. The next prime is 91442513. The reversal of 91442493 is 39424419.

It is not a de Polignac number, because 91442493 - 2² = 91442489 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91442293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1693353 + ... + 1693406.

It is an arithmetic number, because the mean of its divisors is an integer number (16933800).

Almost surely, 2^91442493 is an apocalyptic number.

It is an amenable number.

91442493 is a deficient number, since it is larger than the sum of its proper divisors (44027907).

91442493 is a wasteful number, since it uses less digits than its factorization.

91442493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3386768 (or 3386762 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 91442493 is about 9562.5568233606. The cubic root of 91442493 is about 450.5220164299.

The spelling of 91442493 in words is "ninety-one million, four hundred forty-two thousand, four hundred ninety-three".