117508421 has 2 divisors, whose sum is σ = 117508422. Its totient is φ = 117508420.

The previous prime is 117508399. The next prime is 117508429. The reversal of 117508421 is 124805711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96805921 + 20702500 = 9839^2 + 4550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117508421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117508429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58754210 + 58754211.

It is an arithmetic number, because the mean of its divisors is an integer number (58754211).

Almost surely, 2^117508421 is an apocalyptic number.

It is an amenable number.

117508421 is a deficient number, since it is larger than the sum of its proper divisors (1).

117508421 is an equidigital number, since it uses as much as digits as its factorization.

117508421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 117508421 is about 10840.1301191452. The cubic root of 117508421 is about 489.8047549217.

The spelling of 117508421 in words is "one hundred seventeen million, five hundred eight thousand, four hundred twenty-one".