117789421 has 2 divisors, whose sum is σ = 117789422. Its totient is φ = 117789420.

The previous prime is 117789391. The next prime is 117789431. The reversal of 117789421 is 124987711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76650025 + 41139396 = 8755^2 + 6414^2 .

It is a cyclic number.

It is not a de Polignac number, because 117789421 - 2⁷ = 117789293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117789431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58894710 + 58894711.

It is an arithmetic number, because the mean of its divisors is an integer number (58894711).

Almost surely, 2^117789421 is an apocalyptic number.

It is an amenable number.

117789421 is a deficient number, since it is larger than the sum of its proper divisors (1).

117789421 is an equidigital number, since it uses as much as digits as its factorization.

117789421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 40.

The square root of 117789421 is about 10853.0834789013. The cubic root of 117789421 is about 490.1948704291.

The spelling of 117789421 in words is "one hundred seventeen million, seven hundred eighty-nine thousand, four hundred twenty-one".