61111623 has 4 divisors (see below), whose sum is σ = 81482168. Its totient is φ = 40741080.

The previous prime is 61111601. The next prime is 61111637. The reversal of 61111623 is 32611116.

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

It is not a de Polignac number, because 61111623 - 2⁵ = 61111591 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61111623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61111223) 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, 10185268 + ... + 10185273.

It is an arithmetic number, because the mean of its divisors is an integer number (20370542).

Almost surely, 2^61111623 is an apocalyptic number.

61111623 is a deficient number, since it is larger than the sum of its proper divisors (20370545).

61111623 is a wasteful number, since it uses less digits than its factorization.

61111623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20370544.

The product of its digits is 216, while the sum is 21.

The square root of 61111623 is about 7817.3923401605. The cubic root of 61111623 is about 393.8896832708.

Adding to 61111623 its reverse (32611116), we get a palindrome (93722739).

The spelling of 61111623 in words is "sixty-one million, one hundred eleven thousand, six hundred twenty-three".