172730137 has 2 divisors, whose sum is σ = 172730138. Its totient is φ = 172730136.

The previous prime is 172730113. The next prime is 172730141. The reversal of 172730137 is 731037271.

172730137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168714121 + 4016016 = 12989^2 + 2004^2 .

It is a cyclic number.

It is not a de Polignac number, because 172730137 - 2⁷ = 172730009 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 172730099 and 172730108.

It is not a weakly prime, because it can be changed into another prime (172730147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86365068 + 86365069.

It is an arithmetic number, because the mean of its divisors is an integer number (86365069).

Almost surely, 2^172730137 is an apocalyptic number.

It is an amenable number.

172730137 is a deficient number, since it is larger than the sum of its proper divisors (1).

172730137 is an equidigital number, since it uses as much as digits as its factorization.

172730137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6174, while the sum is 31.

The square root of 172730137 is about 13142.6837822417. The cubic root of 172730137 is about 556.9155861835.

The spelling of 172730137 in words is "one hundred seventy-two million, seven hundred thirty thousand, one hundred thirty-seven".