117109561 has 2 divisors, whose sum is σ = 117109562. Its totient is φ = 117109560.

The previous prime is 117109547. The next prime is 117109567. The reversal of 117109561 is 165901711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105678400 + 11431161 = 10280^2 + 3381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117109561 is a prime.

It is a super-2 number, since 2×117109561² = 27429298555225442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (117109567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58554780 + 58554781.

It is an arithmetic number, because the mean of its divisors is an integer number (58554781).

Almost surely, 2^117109561 is an apocalyptic number.

It is an amenable number.

117109561 is a deficient number, since it is larger than the sum of its proper divisors (1).

117109561 is an equidigital number, since it uses as much as digits as its factorization.

117109561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 31.

The square root of 117109561 is about 10821.7171003496. The cubic root of 117109561 is about 489.2499436662.

The spelling of 117109561 in words is "one hundred seventeen million, one hundred nine thousand, five hundred sixty-one".