50172002081 has 2 divisors, whose sum is σ = 50172002082. Its totient is φ = 50172002080.

The previous prime is 50172002077. The next prime is 50172002117. The reversal of 50172002081 is 18020027105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35847742225 + 14324259856 = 189335^2 + 119684^2 .

It is a cyclic number.

It is not a de Polignac number, because 50172002081 - 2² = 50172002077 is a prime.

It is a super-2 number, since 2×50172002081² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 50172002081.

It is not a weakly prime, because it can be changed into another prime (50172002011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25086001040 + 25086001041.

It is an arithmetic number, because the mean of its divisors is an integer number (25086001041).

Almost surely, 2^50172002081 is an apocalyptic number.

It is an amenable number.

50172002081 is a deficient number, since it is larger than the sum of its proper divisors (1).

50172002081 is an equidigital number, since it uses as much as digits as its factorization.

50172002081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

Adding to 50172002081 its reverse (18020027105), we get a palindrome (68192029186).

The spelling of 50172002081 in words is "fifty billion, one hundred seventy-two million, two thousand, eighty-one".