61109887 has 2 divisors, whose sum is σ = 61109888. Its totient is φ = 61109886.

The previous prime is 61109879. The next prime is 61109911. The reversal of 61109887 is 78890116.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61109887 - 2³ = 61109879 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61109857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30554943 + 30554944.

It is an arithmetic number, because the mean of its divisors is an integer number (30554944).

Almost surely, 2^61109887 is an apocalyptic number.

61109887 is a deficient number, since it is larger than the sum of its proper divisors (1).

61109887 is an equidigital number, since it uses as much as digits as its factorization.

61109887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 61109887 is about 7817.2813049039. The cubic root of 61109887 is about 393.8859534895.

The spelling of 61109887 in words is "sixty-one million, one hundred nine thousand, eight hundred eighty-seven".