51672217 has 2 divisors, whose sum is σ = 51672218. Its totient is φ = 51672216.

The previous prime is 51672211. The next prime is 51672221. The reversal of 51672217 is 71227615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51494976 + 177241 = 7176^2 + 421^2 .

It is a cyclic number.

It is not a de Polignac number, because 51672217 - 2¹⁵ = 51639449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51672211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25836108 + 25836109.

It is an arithmetic number, because the mean of its divisors is an integer number (25836109).

Almost surely, 2^51672217 is an apocalyptic number.

It is an amenable number.

51672217 is a deficient number, since it is larger than the sum of its proper divisors (1).

51672217 is an equidigital number, since it uses as much as digits as its factorization.

51672217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5880, while the sum is 31.

The square root of 51672217 is about 7188.3389597319. The cubic root of 51672217 is about 372.4651968145.

The spelling of 51672217 in words is "fifty-one million, six hundred seventy-two thousand, two hundred seventeen".