61111140 has 48 divisors (see below), whose sum is σ = 171451392. Its totient is φ = 16263936.

The previous prime is 61111133. The next prime is 61111159. The reversal of 61111140 is 4111116.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55677 + ... + 56763.

It is an arithmetic number, because the mean of its divisors is an integer number (3571904).

Almost surely, 2^61111140 is an apocalyptic number.

61111140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61111140 is an abundant number, since it is smaller than the sum of its proper divisors (110340252).

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

61111140 is a wasteful number, since it uses less digits than its factorization.

61111140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036 (or 2034 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

The square root of 61111140 is about 7817.3614474450. The cubic root of 61111140 is about 393.8886455564. Note that the first 3 decimals are identical.

Subtracting from 61111140 its product of nonzero digits (24), we obtain a palindrome (61111116).

Adding to 61111140 its reverse (4111116), we get a palindrome (65222256).

The spelling of 61111140 in words is "sixty-one million, one hundred eleven thousand, one hundred forty".