116781221 has 2 divisors, whose sum is σ = 116781222. Its totient is φ = 116781220.

The previous prime is 116781209. The next prime is 116781253. The reversal of 116781221 is 122187611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110481121 + 6300100 = 10511^2 + 2510^2 .

It is a cyclic number.

It is not a de Polignac number, because 116781221 - 2⁶ = 116781157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (116784221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58390610 + 58390611.

It is an arithmetic number, because the mean of its divisors is an integer number (58390611).

Almost surely, 2^116781221 is an apocalyptic number.

It is an amenable number.

116781221 is a deficient number, since it is larger than the sum of its proper divisors (1).

116781221 is an equidigital number, since it uses as much as digits as its factorization.

116781221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 29.

The square root of 116781221 is about 10806.5360314950. The cubic root of 116781221 is about 488.7922790984.

The spelling of 116781221 in words is "one hundred sixteen million, seven hundred eighty-one thousand, two hundred twenty-one".