142105897 has 4 divisors (see below), whose sum is σ = 142284996. Its totient is φ = 141926800.

The previous prime is 142105867. The next prime is 142105939. The reversal of 142105897 is 798501241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798501241 = 6343 ⋅125887.

It can be written as a sum of positive squares in 2 ways, for example, as 91183401 + 50922496 = 9549^2 + 7136^2 .

It is a cyclic number.

It is not a de Polignac number, because 142105897 - 2²⁷ = 7888169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142105867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88354 + ... + 89947.

It is an arithmetic number, because the mean of its divisors is an integer number (35571249).

Almost surely, 2^142105897 is an apocalyptic number.

It is an amenable number.

142105897 is a deficient number, since it is larger than the sum of its proper divisors (179099).

142105897 is an equidigital number, since it uses as much as digits as its factorization.

142105897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179098.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 142105897 is about 11920.8177991277. The cubic root of 142105897 is about 521.8400015111.

The spelling of 142105897 in words is "one hundred forty-two million, one hundred five thousand, eight hundred ninety-seven".