61138111 has 2 divisors, whose sum is σ = 61138112. Its totient is φ = 61138110.

The previous prime is 61138109. The next prime is 61138139. The reversal of 61138111 is 11183116.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61138111 - 2¹ = 61138109 is a prime.

Together with 61138109, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61138411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30569055 + 30569056.

It is an arithmetic number, because the mean of its divisors is an integer number (30569056).

Almost surely, 2^61138111 is an apocalyptic number.

61138111 is a deficient number, since it is larger than the sum of its proper divisors (1).

61138111 is an equidigital number, since it uses as much as digits as its factorization.

61138111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 22.

The square root of 61138111 is about 7819.0863276984. The cubic root of 61138111 is about 393.9465837554.

The spelling of 61138111 in words is "sixty-one million, one hundred thirty-eight thousand, one hundred eleven".