142091251 has 4 divisors (see below), whose sum is σ = 144772272. Its totient is φ = 139410232.

The previous prime is 142091239. The next prime is 142091353. The reversal of 142091251 is 152190241.

It is a happy number.

142091251 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142091251 is a prime.

It is a super-2 number, since 2×142091251² = 40379847221490002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142091231) 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, 1340431 + ... + 1340536.

It is an arithmetic number, because the mean of its divisors is an integer number (36193068).

Almost surely, 2^142091251 is an apocalyptic number.

142091251 is a deficient number, since it is larger than the sum of its proper divisors (2681021).

142091251 is an equidigital number, since it uses as much as digits as its factorization.

142091251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681020.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 142091251 is about 11920.2034798069. The cubic root of 142091251 is about 521.8220732585.

The spelling of 142091251 in words is "one hundred forty-two million, ninety-one thousand, two hundred fifty-one".