117397421 has 2 divisors, whose sum is σ = 117397422. Its totient is φ = 117397420.

The previous prime is 117397417. The next prime is 117397457. The reversal of 117397421 is 124793711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117397225 + 196 = 10835^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 117397421 - 2² = 117397417 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 (117397321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58698710 + 58698711.

It is an arithmetic number, because the mean of its divisors is an integer number (58698711).

Almost surely, 2^117397421 is an apocalyptic number.

It is an amenable number.

117397421 is a deficient number, since it is larger than the sum of its proper divisors (1).

117397421 is an equidigital number, since it uses as much as digits as its factorization.

117397421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 35.

The square root of 117397421 is about 10835.0090447586. The cubic root of 117397421 is about 489.6504809972.

The spelling of 117397421 in words is "one hundred seventeen million, three hundred ninety-seven thousand, four hundred twenty-one".