191420065 has 8 divisors (see below), whose sum is σ = 229932648. Its totient is φ = 152983680.

The previous prime is 191420063. The next prime is 191420069. The reversal of 191420065 is 560024191.

191420065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 108409744 + 83010321 = 10412^2 + 9111^2 .

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

It is not a de Polignac number, because 191420065 - 2¹ = 191420063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191420063) 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, 13366 + ... + 23695.

It is an arithmetic number, because the mean of its divisors is an integer number (28741581).

Almost surely, 2^191420065 is an apocalyptic number.

It is an amenable number.

191420065 is a deficient number, since it is larger than the sum of its proper divisors (38512583).

191420065 is a wasteful number, since it uses less digits than its factorization.

191420065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38099.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 191420065 is about 13835.4640326951. The cubic root of 191420065 is about 576.3184013552.

The spelling of 191420065 in words is "one hundred ninety-one million, four hundred twenty thousand, sixty-five".