142638961 has 2 divisors, whose sum is σ = 142638962. Its totient is φ = 142638960.

The previous prime is 142638949. The next prime is 142638971. The reversal of 142638961 is 169836241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72999936 + 69639025 = 8544^2 + 8345^2 .

It is a cyclic number.

It is not a de Polignac number, because 142638961 - 2¹¹ = 142636913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (142638901) 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, 71319480 + 71319481.

It is an arithmetic number, because the mean of its divisors is an integer number (71319481).

Almost surely, 2^142638961 is an apocalyptic number.

It is an amenable number.

142638961 is a deficient number, since it is larger than the sum of its proper divisors (1).

142638961 is an equidigital number, since it uses as much as digits as its factorization.

142638961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 142638961 is about 11943.1554038286. The cubic root of 142638961 is about 522.4916916027.

The spelling of 142638961 in words is "one hundred forty-two million, six hundred thirty-eight thousand, nine hundred sixty-one".