201231517 has 2 divisors, whose sum is σ = 201231518. Its totient is φ = 201231516.

The previous prime is 201231479. The next prime is 201231553. The reversal of 201231517 is 715132102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168844036 + 32387481 = 12994^2 + 5691^2 .

It is a cyclic number.

It is not a de Polignac number, because 201231517 - 2⁷ = 201231389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201231587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100615758 + 100615759.

It is an arithmetic number, because the mean of its divisors is an integer number (100615759).

Almost surely, 2^201231517 is an apocalyptic number.

It is an amenable number.

201231517 is a deficient number, since it is larger than the sum of its proper divisors (1).

201231517 is an equidigital number, since it uses as much as digits as its factorization.

201231517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 201231517 is about 14185.6095040009. The cubic root of 201231517 is about 586.0014181843.

Adding to 201231517 its reverse (715132102), we get a palindrome (916363619).

The spelling of 201231517 in words is "two hundred one million, two hundred thirty-one thousand, five hundred seventeen".