142136261 has 2 divisors, whose sum is σ = 142136262. Its totient is φ = 142136260.

The previous prime is 142136227. The next prime is 142136273. The reversal of 142136261 is 162631241.

142136261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139476100 + 2660161 = 11810^2 + 1631^2 .

It is a cyclic number.

It is not a de Polignac number, because 142136261 - 2¹⁴ = 142119877 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 142136261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142136861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71068130 + 71068131.

It is an arithmetic number, because the mean of its divisors is an integer number (71068131).

Almost surely, 2^142136261 is an apocalyptic number.

It is an amenable number.

142136261 is a deficient number, since it is larger than the sum of its proper divisors (1).

142136261 is an equidigital number, since it uses as much as digits as its factorization.

142136261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 142136261 is about 11922.0913014454. The cubic root of 142136261 is about 521.8771663338.

The spelling of 142136261 in words is "one hundred forty-two million, one hundred thirty-six thousand, two hundred sixty-one".