191622081 has 8 divisors (see below), whose sum is σ = 291995584. Its totient is φ = 109498320.

The previous prime is 191622059. The next prime is 191622091. The reversal of 191622081 is 180226191.

It is a happy number.

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

It is not a de Polignac number, because 191622081 - 2¹³ = 191613889 is a prime.

It is a super-2 number, since 2×191622081² = 73438043853541122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191622091) 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 in 7 ways as a sum of consecutive naturals, for example, 4562410 + ... + 4562451.

It is an arithmetic number, because the mean of its divisors is an integer number (36499448).

Almost surely, 2^191622081 is an apocalyptic number.

It is an amenable number.

191622081 is a deficient number, since it is larger than the sum of its proper divisors (100373503).

191622081 is an equidigital number, since it uses as much as digits as its factorization.

191622081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9124871.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 191622081 is about 13842.7627661533. The cubic root of 191622081 is about 576.5210701218.

The spelling of 191622081 in words is "one hundred ninety-one million, six hundred twenty-two thousand, eighty-one".