142171247 has 2 divisors, whose sum is σ = 142171248. Its totient is φ = 142171246.

The previous prime is 142171219. The next prime is 142171259. The reversal of 142171247 is 742171241.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142171247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142171277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71085623 + 71085624.

It is an arithmetic number, because the mean of its divisors is an integer number (71085624).

Almost surely, 2^142171247 is an apocalyptic number.

142171247 is a deficient number, since it is larger than the sum of its proper divisors (1).

142171247 is an equidigital number, since it uses as much as digits as its factorization.

142171247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3136, while the sum is 29.

The square root of 142171247 is about 11923.5584872973. The cubic root of 142171247 is about 521.9199818137.

The spelling of 142171247 in words is "one hundred forty-two million, one hundred seventy-one thousand, two hundred forty-seven".