61111099 has 4 divisors (see below), whose sum is σ = 69841264. Its totient is φ = 52380936.

The previous prime is 61111031. The next prime is 61111103. The reversal of 61111099 is 99011116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61111099 - 2⁹ = 61110587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61111019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4365072 + ... + 4365085.

It is an arithmetic number, because the mean of its divisors is an integer number (17460316).

Almost surely, 2^61111099 is an apocalyptic number.

61111099 is a deficient number, since it is larger than the sum of its proper divisors (8730165).

61111099 is an equidigital number, since it uses as much as digits as its factorization.

61111099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8730164.

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

The square root of 61111099 is about 7817.3588250764. The cubic root of 61111099 is about 393.8885574686. Note that the first 3 decimals are identical.

The spelling of 61111099 in words is "sixty-one million, one hundred eleven thousand, ninety-nine".