8190091 has 8 divisors (see below), whose sum is σ = 10080224. Its totient is φ = 6480000.

The previous prime is 8190067. The next prime is 8190097. The reversal of 8190091 is 1900918.

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

It is a 7-Lehmer number, since φ(8190091) divides (8190091-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 8190091 - 2⁷ = 8189963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8190097) 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, 44910 + ... + 45091.

It is an arithmetic number, because the mean of its divisors is an integer number (1260028).

Almost surely, 2^8190091 is an apocalyptic number.

8190091 is a deficient number, since it is larger than the sum of its proper divisors (1890133).

8190091 is a wasteful number, since it uses less digits than its factorization.

8190091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90021.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 8190091 is about 2861.8335031934. The cubic root of 8190091 is about 201.5717079823.

It can be divided in two parts, 81900 and 91, that multiplied together give a square (7452900 = 2730²).

The spelling of 8190091 in words is "eight million, one hundred ninety thousand, ninety-one".