61111818 has 12 divisors (see below), whose sum is σ = 132408978. Its totient is φ = 20370600.

The previous prime is 61111783. The next prime is 61111823. The reversal of 61111818 is 81811116.

61111818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 50594769 + 10517049 = 7113^2 + 3243^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 61111791 and 61111800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1697533 + ... + 1697568.

Almost surely, 2^61111818 is an apocalyptic number.

61111818 is an abundant number, since it is smaller than the sum of its proper divisors (71297160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61111818 is a wasteful number, since it uses less digits than its factorization.

61111818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3395109 (or 3395106 counting only the distinct ones).

The product of its digits is 384, while the sum is 27.

The square root of 61111818 is about 7817.4048123402. The cubic root of 61111818 is about 393.8901022222.

The spelling of 61111818 in words is "sixty-one million, one hundred eleven thousand, eight hundred eighteen".