142931251 has 2 divisors, whose sum is σ = 142931252. Its totient is φ = 142931250.

The previous prime is 142931249. The next prime is 142931263. The reversal of 142931251 is 152139241.

It is a weak prime.

It is an emirp because it is prime and its reverse (152139241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142931251 - 2¹ = 142931249 is a prime.

Together with 142931249, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142931051) 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 as a sum of consecutive naturals, namely, 71465625 + 71465626.

It is an arithmetic number, because the mean of its divisors is an integer number (71465626).

Almost surely, 2^142931251 is an apocalyptic number.

142931251 is a deficient number, since it is larger than the sum of its proper divisors (1).

142931251 is an equidigital number, since it uses as much as digits as its factorization.

142931251 is an odious number, because the sum of its binary digits is odd.

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

The square root of 142931251 is about 11955.3858574284. The cubic root of 142931251 is about 522.8483377317.

The spelling of 142931251 in words is "one hundred forty-two million, nine hundred thirty-one thousand, two hundred fifty-one".