142521139 has 2 divisors, whose sum is σ = 142521140. Its totient is φ = 142521138.

The previous prime is 142521121. The next prime is 142521157. The reversal of 142521139 is 931125241.

It is a balanced prime because it is at equal distance from previous prime (142521121) and next prime (142521157).

It is a cyclic number.

It is not a de Polignac number, because 142521139 - 2¹⁵ = 142488371 is a prime.

It is not a weakly prime, because it can be changed into another prime (142524139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71260569 + 71260570.

It is an arithmetic number, because the mean of its divisors is an integer number (71260570).

Almost surely, 2^142521139 is an apocalyptic number.

142521139 is a deficient number, since it is larger than the sum of its proper divisors (1).

142521139 is an equidigital number, since it uses as much as digits as its factorization.

142521139 is an evil number, because the sum of its binary digits is even.

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

The square root of 142521139 is about 11938.2217687560. The cubic root of 142521139 is about 522.3477898861.

The spelling of 142521139 in words is "one hundred forty-two million, five hundred twenty-one thousand, one hundred thirty-nine".