61100111 has 4 divisors (see below), whose sum is σ = 61356000. Its totient is φ = 60844224.

The previous prime is 61100093. The next prime is 61100147. The reversal of 61100111 is 11100116.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61100111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61100092 and 61100101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61100311) 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, 127586 + ... + 128063.

It is an arithmetic number, because the mean of its divisors is an integer number (15339000).

Almost surely, 2^61100111 is an apocalyptic number.

61100111 is a deficient number, since it is larger than the sum of its proper divisors (255889).

61100111 is a wasteful number, since it uses less digits than its factorization.

61100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255888.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 61100111 is about 7816.6559985713. The cubic root of 61100111 is about 393.8649485173.

Adding to 61100111 its reverse (11100116), we get a palindrome (72200227).

The spelling of 61100111 in words is "sixty-one million, one hundred thousand, one hundred eleven".