142051809 has 16 divisors (see below), whose sum is σ = 201242880. Its totient is φ = 88874640.

The previous prime is 142051799. The next prime is 142051829. The reversal of 142051809 is 908150241.

It is a happy number.

142051809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 142051809 - 2⁷ = 142051681 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (142051829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5547 + ... + 17744.

It is an arithmetic number, because the mean of its divisors is an integer number (12577680).

Almost surely, 2^142051809 is an apocalyptic number.

142051809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

142051809 is a deficient number, since it is larger than the sum of its proper divisors (59191071).

142051809 is a wasteful number, since it uses less digits than its factorization.

142051809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23420.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 142051809 is about 11918.5489469146. The cubic root of 142051809 is about 521.7737859532.

The spelling of 142051809 in words is "one hundred forty-two million, fifty-one thousand, eight hundred nine".