68477221 has 2 divisors, whose sum is σ = 68477222. Its totient is φ = 68477220.

The previous prime is 68477203. The next prime is 68477231. The reversal of 68477221 is 12277486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56325025 + 12152196 = 7505^2 + 3486^2 .

It is a cyclic number.

It is not a de Polignac number, because 68477221 - 2¹⁹ = 67952933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68477231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34238610 + 34238611.

It is an arithmetic number, because the mean of its divisors is an integer number (34238611).

Almost surely, 2^68477221 is an apocalyptic number.

It is an amenable number.

68477221 is a deficient number, since it is larger than the sum of its proper divisors (1).

68477221 is an equidigital number, since it uses as much as digits as its factorization.

68477221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 37.

The square root of 68477221 is about 8275.0964344834. The cubic root of 68477221 is about 409.1181143913.

The spelling of 68477221 in words is "sixty-eight million, four hundred seventy-seven thousand, two hundred twenty-one".