142491247 has 4 divisors (see below), whose sum is σ = 143344656. Its totient is φ = 141637840.

The previous prime is 142491227. The next prime is 142491253. The reversal of 142491247 is 742194241.

It is a happy number.

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 142491247 - 2¹⁵ = 142458479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142491227) 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, 426454 + ... + 426787.

It is an arithmetic number, because the mean of its divisors is an integer number (35836164).

Almost surely, 2^142491247 is an apocalyptic number.

142491247 is a deficient number, since it is larger than the sum of its proper divisors (853409).

142491247 is an equidigital number, since it uses as much as digits as its factorization.

142491247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853408.

The product of its digits is 16128, while the sum is 34.

The square root of 142491247 is about 11936.9697578573. The cubic root of 142491247 is about 522.3112687263.

The spelling of 142491247 in words is "one hundred forty-two million, four hundred ninety-one thousand, two hundred forty-seven".