117566621 has 2 divisors, whose sum is σ = 117566622. Its totient is φ = 117566620.

The previous prime is 117566591. The next prime is 117566627. The reversal of 117566621 is 126665711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116877721 + 688900 = 10811^2 + 830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117566621 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 (117566627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58783310 + 58783311.

It is an arithmetic number, because the mean of its divisors is an integer number (58783311).

Almost surely, 2^117566621 is an apocalyptic number.

It is an amenable number.

117566621 is a deficient number, since it is larger than the sum of its proper divisors (1).

117566621 is an equidigital number, since it uses as much as digits as its factorization.

117566621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 117566621 is about 10842.8142564557. The cubic root of 117566621 is about 489.8856056712.

The spelling of 117566621 in words is "one hundred seventeen million, five hundred sixty-six thousand, six hundred twenty-one".