142656217 has 6 divisors (see below), whose sum is σ = 156804074. Its totient is φ = 129687360.

The previous prime is 142656209. The next prime is 142656221. The reversal of 142656217 is 712656241.

It can be written as a sum of positive squares in only one way, i.e., 109432521 + 33223696 = 10461^2 + 5764^2 .

It is not a de Polignac number, because 142656217 - 2³ = 142656209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142656287) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 589368 + ... + 589609.

Almost surely, 2^142656217 is an apocalyptic number.

It is an amenable number.

142656217 is a deficient number, since it is larger than the sum of its proper divisors (14147857).

142656217 is a wasteful number, since it uses less digits than its factorization.

142656217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178999 (or 1178988 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 142656217 is about 11943.8778041304. The cubic root of 142656217 is about 522.5127605379.

The spelling of 142656217 in words is "one hundred forty-two million, six hundred fifty-six thousand, two hundred seventeen".