142617521 has 2 divisors, whose sum is σ = 142617522. Its totient is φ = 142617520.

The previous prime is 142617509. The next prime is 142617533. The reversal of 142617521 is 125716241.

It is a balanced prime because it is at equal distance from previous prime (142617509) and next prime (142617533).

It can be written as a sum of positive squares in only one way, i.e., 136422400 + 6195121 = 11680^2 + 2489^2 .

It is a cyclic number.

It is not a de Polignac number, because 142617521 - 2²² = 138423217 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (142617551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71308760 + 71308761.

It is an arithmetic number, because the mean of its divisors is an integer number (71308761).

Almost surely, 2^142617521 is an apocalyptic number.

It is an amenable number.

142617521 is a deficient number, since it is larger than the sum of its proper divisors (1).

142617521 is an equidigital number, since it uses as much as digits as its factorization.

142617521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 29.

The square root of 142617521 is about 11942.2577848579. The cubic root of 142617521 is about 522.4655117915.

The spelling of 142617521 in words is "one hundred forty-two million, six hundred seventeen thousand, five hundred twenty-one".