91091426 has 8 divisors (see below), whose sum is σ = 137620560. Its totient is φ = 45217908.

The previous prime is 91091401. The next prime is 91091461. The reversal of 91091426 is 62419019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 91091392 and 91091401.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163556 + ... + 164111.

It is an arithmetic number, because the mean of its divisors is an integer number (17202570).

Almost surely, 2^91091426 is an apocalyptic number.

91091426 is a deficient number, since it is larger than the sum of its proper divisors (46529134).

91091426 is a wasteful number, since it uses less digits than its factorization.

91091426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327808.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 91091426 is about 9544.1828356334. The cubic root of 91091426 is about 449.9447273676.

The spelling of 91091426 in words is "ninety-one million, ninety-one thousand, four hundred twenty-six".