30172217 has 2 divisors, whose sum is σ = 30172218. Its totient is φ = 30172216.

The previous prime is 30172213. The next prime is 30172237. The reversal of 30172217 is 71227103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25694761 + 4477456 = 5069^2 + 2116^2 .

It is a cyclic number.

It is not a de Polignac number, because 30172217 - 2² = 30172213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30172192 and 30172201.

It is not a weakly prime, because it can be changed into another prime (30172213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15086108 + 15086109.

It is an arithmetic number, because the mean of its divisors is an integer number (15086109).

Almost surely, 2^30172217 is an apocalyptic number.

It is an amenable number.

30172217 is a deficient number, since it is larger than the sum of its proper divisors (1).

30172217 is an equidigital number, since it uses as much as digits as its factorization.

30172217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 30172217 is about 5492.9242667272. The cubic root of 30172217 is about 311.3166923209.

The spelling of 30172217 in words is "thirty million, one hundred seventy-two thousand, two hundred seventeen".