115117661 has 2 divisors, whose sum is σ = 115117662. Its totient is φ = 115117660.

The previous prime is 115117633. The next prime is 115117669. The reversal of 115117661 is 166711511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76912900 + 38204761 = 8770^2 + 6181^2 .

It is an emirp because it is prime and its reverse (166711511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115117661 - 2¹⁰ = 115116637 is a prime.

It is a super-2 number, since 2×115117661² = 26504151748221842, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115117669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57558830 + 57558831.

It is an arithmetic number, because the mean of its divisors is an integer number (57558831).

Almost surely, 2^115117661 is an apocalyptic number.

It is an amenable number.

115117661 is a deficient number, since it is larger than the sum of its proper divisors (1).

115117661 is an equidigital number, since it uses as much as digits as its factorization.

115117661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 29.

The square root of 115117661 is about 10729.2898646649. The cubic root of 115117661 is about 486.4602055270.

The spelling of 115117661 in words is "one hundred fifteen million, one hundred seventeen thousand, six hundred sixty-one".