201501281 has 2 divisors, whose sum is σ = 201501282. Its totient is φ = 201501280.

The previous prime is 201501277. The next prime is 201501299. The reversal of 201501281 is 182105102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173580625 + 27920656 = 13175^2 + 5284^2 .

It is a cyclic number.

It is not a de Polignac number, because 201501281 - 2² = 201501277 is a prime.

It is a super-2 number, since 2×201501281² = 81205532489281922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201501481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100750640 + 100750641.

It is an arithmetic number, because the mean of its divisors is an integer number (100750641).

Almost surely, 2^201501281 is an apocalyptic number.

It is an amenable number.

201501281 is a deficient number, since it is larger than the sum of its proper divisors (1).

201501281 is an equidigital number, since it uses as much as digits as its factorization.

201501281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 201501281 is about 14195.1146878072. The cubic root of 201501281 is about 586.2631589920.

Adding to 201501281 its reverse (182105102), we get a palindrome (383606383).

The spelling of 201501281 in words is "two hundred one million, five hundred one thousand, two hundred eighty-one".