142031861 has 2 divisors, whose sum is σ = 142031862. Its totient is φ = 142031860.

The previous prime is 142031849. The next prime is 142031887. The reversal of 142031861 is 168130241.

It is an a-pointer prime, because the next prime (142031887) can be obtained adding 142031861 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84180625 + 57851236 = 9175^2 + 7606^2 .

It is a cyclic number.

It is not a de Polignac number, because 142031861 - 2⁶ = 142031797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 142031861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142031161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71015930 + 71015931.

It is an arithmetic number, because the mean of its divisors is an integer number (71015931).

Almost surely, 2^142031861 is an apocalyptic number.

It is an amenable number.

142031861 is a deficient number, since it is larger than the sum of its proper divisors (1).

142031861 is an equidigital number, since it uses as much as digits as its factorization.

142031861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 142031861 is about 11917.7120706954. The cubic root of 142031861 is about 521.7493609897.

The spelling of 142031861 in words is "one hundred forty-two million, thirty-one thousand, eight hundred sixty-one".