118017821 has 2 divisors, whose sum is σ = 118017822. Its totient is φ = 118017820.

The previous prime is 118017787. The next prime is 118017857. The reversal of 118017821 is 128710811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84897796 + 33120025 = 9214^2 + 5755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118017821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118017871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59008910 + 59008911.

It is an arithmetic number, because the mean of its divisors is an integer number (59008911).

Almost surely, 2^118017821 is an apocalyptic number.

It is an amenable number.

118017821 is a deficient number, since it is larger than the sum of its proper divisors (1).

118017821 is an equidigital number, since it uses as much as digits as its factorization.

118017821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 29.

The square root of 118017821 is about 10863.6007382451. The cubic root of 118017821 is about 490.5115039024.

The spelling of 118017821 in words is "one hundred eighteen million, seventeen thousand, eight hundred twenty-one".