142911905 has 4 divisors (see below), whose sum is σ = 171494292. Its totient is φ = 114329520.

The previous prime is 142911893. The next prime is 142911941. The reversal of 142911905 is 509119241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509119241 = 17327 ⋅29383.

It can be written as a sum of positive squares in 2 ways, for example, as 99760144 + 43151761 = 9988^2 + 6569^2 .

It is not a de Polignac number, because 142911905 - 2⁴ = 142911889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14291186 + ... + 14291195.

It is an arithmetic number, because the mean of its divisors is an integer number (42873573).

Almost surely, 2^142911905 is an apocalyptic number.

It is an amenable number.

142911905 is a deficient number, since it is larger than the sum of its proper divisors (28582387).

142911905 is an equidigital number, since it uses as much as digits as its factorization.

142911905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28582386.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 142911905 is about 11954.5767386386. The cubic root of 142911905 is about 522.8247471820.

The spelling of 142911905 in words is "one hundred forty-two million, nine hundred eleven thousand, nine hundred five".