13779217 has 2 divisors, whose sum is σ = 13779218. Its totient is φ = 13779216.

The previous prime is 13779193. The next prime is 13779223. The reversal of 13779217 is 71297731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12138256 + 1640961 = 3484^2 + 1281^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13779217 is a prime.

It is a super-2 number, since 2×13779217² = 379733642266178, which contains 22 as substring.

It is equal to p₈₉₆₆₃₅ and since 13779217 and 896635 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (13779257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6889608 + 6889609.

It is an arithmetic number, because the mean of its divisors is an integer number (6889609).

Almost surely, 2^13779217 is an apocalyptic number.

It is an amenable number.

13779217 is a deficient number, since it is larger than the sum of its proper divisors (1).

13779217 is an equidigital number, since it uses as much as digits as its factorization.

13779217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18522, while the sum is 37.

The square root of 13779217 is about 3712.0367724472. The cubic root of 13779217 is about 239.7405587641.

The spelling of 13779217 in words is "thirteen million, seven hundred seventy-nine thousand, two hundred seventeen".