142312591 has 4 divisors (see below), whose sum is σ = 142339032. Its totient is φ = 142286152.

The previous prime is 142312589. The next prime is 142312609. The reversal of 142312591 is 195213241.

142312591 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 not a de Polignac number, because 142312591 - 2¹ = 142312589 is a prime.

It is a super-3 number, since 3×142312591³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142312501) 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, 1936 + ... + 16981.

It is an arithmetic number, because the mean of its divisors is an integer number (35584758).

Almost surely, 2^142312591 is an apocalyptic number.

142312591 is a deficient number, since it is larger than the sum of its proper divisors (26441).

142312591 is an equidigital number, since it uses as much as digits as its factorization.

142312591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26440.

The product of its digits is 2160, while the sum is 28.

The square root of 142312591 is about 11929.4841045202. The cubic root of 142312591 is about 522.0928855617.

The spelling of 142312591 in words is "one hundred forty-two million, three hundred twelve thousand, five hundred ninety-one".