201505124173 has 2 divisors, whose sum is σ = 201505124174. Its totient is φ = 201505124172.

The previous prime is 201505124141. The next prime is 201505124237. The reversal of 201505124173 is 371421505102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190373397124 + 11131727049 = 436318^2 + 105507^2 .

It is a cyclic number.

It is not a de Polignac number, because 201505124173 - 2⁵ = 201505124141 is a prime.

It is a super-2 number, since 2×201505124173² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201505124123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100752562086 + 100752562087.

It is an arithmetic number, because the mean of its divisors is an integer number (100752562087).

Almost surely, 2^201505124173 is an apocalyptic number.

It is an amenable number.

201505124173 is a deficient number, since it is larger than the sum of its proper divisors (1).

201505124173 is an equidigital number, since it uses as much as digits as its factorization.

201505124173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 31.

Adding to 201505124173 its reverse (371421505102), we get a palindrome (572926629275).

The spelling of 201505124173 in words is "two hundred one billion, five hundred five million, one hundred twenty-four thousand, one hundred seventy-three".