117702821 has 2 divisors, whose sum is σ = 117702822. Its totient is φ = 117702820.

The previous prime is 117702803. The next prime is 117702859. The reversal of 117702821 is 128207711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79744900 + 37957921 = 8930^2 + 6161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117702821 is a prime.

It is equal to p_6718223 and since 117702821 and 6718223 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117702521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58851410 + 58851411.

It is an arithmetic number, because the mean of its divisors is an integer number (58851411).

Almost surely, 2^117702821 is an apocalyptic number.

It is an amenable number.

117702821 is a deficient number, since it is larger than the sum of its proper divisors (1).

117702821 is an equidigital number, since it uses as much as digits as its factorization.

117702821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 29.

The square root of 117702821 is about 10849.0930957385. The cubic root of 117702821 is about 490.0747088642.

The spelling of 117702821 in words is "one hundred seventeen million, seven hundred two thousand, eight hundred twenty-one".