108115661 has 2 divisors, whose sum is σ = 108115662. Its totient is φ = 108115660.

The previous prime is 108115649. The next prime is 108115669. The reversal of 108115661 is 166511801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94381225 + 13734436 = 9715^2 + 3706^2 .

It is a cyclic number.

It is not a de Polignac number, because 108115661 - 2¹⁸ = 107853517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108115669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54057830 + 54057831.

It is an arithmetic number, because the mean of its divisors is an integer number (54057831).

Almost surely, 2^108115661 is an apocalyptic number.

It is an amenable number.

108115661 is a deficient number, since it is larger than the sum of its proper divisors (1).

108115661 is an equidigital number, since it uses as much as digits as its factorization.

108115661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 108115661 is about 10397.8680987979. The cubic root of 108115661 is about 476.3902553040.

The spelling of 108115661 in words is "one hundred eight million, one hundred fifteen thousand, six hundred sixty-one".