117662821 has 2 divisors, whose sum is σ = 117662822. Its totient is φ = 117662820.

The previous prime is 117662819. The next prime is 117662869. The reversal of 117662821 is 128266711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114789796 + 2873025 = 10714^2 + 1695^2 .

It is a cyclic number.

It is not a de Polignac number, because 117662821 - 2¹ = 117662819 is a prime.

Together with 117662819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117662221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58831410 + 58831411.

It is an arithmetic number, because the mean of its divisors is an integer number (58831411).

Almost surely, 2^117662821 is an apocalyptic number.

It is an amenable number.

117662821 is a deficient number, since it is larger than the sum of its proper divisors (1).

117662821 is an equidigital number, since it uses as much as digits as its factorization.

117662821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 117662821 is about 10847.2494670308. The cubic root of 117662821 is about 490.0191870871.

The spelling of 117662821 in words is "one hundred seventeen million, six hundred sixty-two thousand, eight hundred twenty-one".