61111121 has 2 divisors, whose sum is σ = 61111122. Its totient is φ = 61111120.

The previous prime is 61111111. The next prime is 61111129. The reversal of 61111121 is 12111116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40960000 + 20151121 = 6400^2 + 4489^2 .

It is a cyclic number.

It is not a de Polignac number, because 61111121 - 2²² = 56916817 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61111096 and 61111105.

It is not a weakly prime, because it can be changed into another prime (61111129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30555560 + 30555561.

It is an arithmetic number, because the mean of its divisors is an integer number (30555561).

Almost surely, 2^61111121 is an apocalyptic number.

It is an amenable number.

61111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

61111121 is an equidigital number, since it uses as much as digits as its factorization.

61111121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12, while the sum is 14.

The square root of 61111121 is about 7817.3602322011. The cubic root of 61111121 is about 393.8886047353. Note that the first 3 decimals are identical.

Adding to 61111121 its reverse (12111116), we get a palindrome (73222237).

It can be divided in two parts, 6 and 1111121, that multiplied together give a triangular number (6666726 = T₃₆₅₁).

The spelling of 61111121 in words is "sixty-one million, one hundred eleven thousand, one hundred twenty-one".