146191809 has 4 divisors (see below), whose sum is σ = 194922416. Its totient is φ = 97461204.

The previous prime is 146191783. The next prime is 146191817. The reversal of 146191809 is 908191641.

146191809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 146191809 - 2⁸ = 146191553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146191849) 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, 24365299 + ... + 24365304.

It is an arithmetic number, because the mean of its divisors is an integer number (48730604).

Almost surely, 2^146191809 is an apocalyptic number.

It is an amenable number.

146191809 is a deficient number, since it is larger than the sum of its proper divisors (48730607).

146191809 is an equidigital number, since it uses as much as digits as its factorization.

146191809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48730606.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 146191809 is about 12090.9804813340. The cubic root of 146191809 is about 526.7942347519.

The spelling of 146191809 in words is "one hundred forty-six million, one hundred ninety-one thousand, eight hundred nine".