142195681 has 4 divisors (see below), whose sum is σ = 142269232. Its totient is φ = 142122132.

The previous prime is 142195673. The next prime is 142195687. The reversal of 142195681 is 186591241.

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 a cyclic number.

It is not a de Polignac number, because 142195681 - 2³ = 142195673 is a prime.

It is a super-2 number, since 2×142195681² = 40439223390107522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142195681.

It is not an unprimeable number, because it can be changed into a prime (142195687) 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, 33795 + ... + 37768.

It is an arithmetic number, because the mean of its divisors is an integer number (35567308).

Almost surely, 2^142195681 is an apocalyptic number.

It is an amenable number.

142195681 is a deficient number, since it is larger than the sum of its proper divisors (73551).

142195681 is an equidigital number, since it uses as much as digits as its factorization.

142195681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73550.

The product of its digits is 17280, while the sum is 37.

The square root of 142195681 is about 11924.5830535076. The cubic root of 142195681 is about 521.9498797070.

It can be divided in two parts, 14219 and 5681, that added together give a triangular number (19900 = T₁₉₉).

The spelling of 142195681 in words is "one hundred forty-two million, one hundred ninety-five thousand, six hundred eighty-one".