68375221 has 2 divisors, whose sum is σ = 68375222. Its totient is φ = 68375220.

The previous prime is 68375179. The next prime is 68375239. The reversal of 68375221 is 12257386.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50608996 + 17766225 = 7114^2 + 4215^2 .

It is a cyclic number.

It is not a de Polignac number, because 68375221 - 2¹³ = 68367029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68375821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34187610 + 34187611.

It is an arithmetic number, because the mean of its divisors is an integer number (34187611).

Almost surely, 2^68375221 is an apocalyptic number.

It is an amenable number.

68375221 is a deficient number, since it is larger than the sum of its proper divisors (1).

68375221 is an equidigital number, since it uses as much as digits as its factorization.

68375221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 34.

The square root of 68375221 is about 8268.9310675564. The cubic root of 68375221 is about 408.9148799734.

The spelling of 68375221 in words is "sixty-eight million, three hundred seventy-five thousand, two hundred twenty-one".