191089069 has 4 divisors (see below), whose sum is σ = 195749820. Its totient is φ = 186428320.

The previous prime is 191089049. The next prime is 191089081. The reversal of 191089069 is 960980191.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41344900 + 149744169 = 6430^2 + 12237^2 .

It is a cyclic number.

It is not a de Polignac number, because 191089069 - 2⁷ = 191088941 is a prime.

It is a super-2 number, since 2×191089069² = 73030064582573522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191089039) 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, 2330314 + ... + 2330395.

It is an arithmetic number, because the mean of its divisors is an integer number (48937455).

Almost surely, 2^191089069 is an apocalyptic number.

It is an amenable number.

191089069 is a deficient number, since it is larger than the sum of its proper divisors (4660751).

191089069 is an equidigital number, since it uses as much as digits as its factorization.

191089069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4660750.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 191089069 is about 13823.4969888231. The cubic root of 191089069 is about 575.9860273826.

The spelling of 191089069 in words is "one hundred ninety-one million, eighty-nine thousand, sixty-nine".