109993561 has 2 divisors, whose sum is σ = 109993562. Its totient is φ = 109993560.

The previous prime is 109993537. The next prime is 109993579. The reversal of 109993561 is 165399901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56250000 + 53743561 = 7500^2 + 7331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109993561 is a prime.

It is a super-2 number, since 2×109993561² = 24197166922921442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (109993511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54996780 + 54996781.

It is an arithmetic number, because the mean of its divisors is an integer number (54996781).

Almost surely, 2^109993561 is an apocalyptic number.

It is an amenable number.

109993561 is a deficient number, since it is larger than the sum of its proper divisors (1).

109993561 is an equidigital number, since it uses as much as digits as its factorization.

109993561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65610, while the sum is 43.

The square root of 109993561 is about 10487.7815099286. The cubic root of 109993561 is about 479.1326364473.

The spelling of 109993561 in words is "one hundred nine million, nine hundred ninety-three thousand, five hundred sixty-one".