142951639 has 2 divisors, whose sum is σ = 142951640. Its totient is φ = 142951638.

The previous prime is 142951637. The next prime is 142951673. The reversal of 142951639 is 936159241.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 142951639 - 2¹ = 142951637 is a prime.

Together with 142951637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142951637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71475819 + 71475820.

It is an arithmetic number, because the mean of its divisors is an integer number (71475820).

Almost surely, 2^142951639 is an apocalyptic number.

142951639 is a deficient number, since it is larger than the sum of its proper divisors (1).

142951639 is an equidigital number, since it uses as much as digits as its factorization.

142951639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 142951639 is about 11956.2384971194. The cubic root of 142951639 is about 522.8731965945.

The spelling of 142951639 in words is "one hundred forty-two million, nine hundred fifty-one thousand, six hundred thirty-nine".