61109911 has 2 divisors, whose sum is σ = 61109912. Its totient is φ = 61109910.

The previous prime is 61109887. The next prime is 61109921. The reversal of 61109911 is 11990116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61109911 - 2⁵ = 61109879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61109911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61109921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30554955 + 30554956.

It is an arithmetic number, because the mean of its divisors is an integer number (30554956).

Almost surely, 2^61109911 is an apocalyptic number.

61109911 is a deficient number, since it is larger than the sum of its proper divisors (1).

61109911 is an equidigital number, since it uses as much as digits as its factorization.

61109911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 28.

The square root of 61109911 is about 7817.2828399643. The cubic root of 61109911 is about 393.8860050537.

The spelling of 61109911 in words is "sixty-one million, one hundred nine thousand, nine hundred eleven".