61111709 has 2 divisors, whose sum is σ = 61111710. Its totient is φ = 61111708.

The previous prime is 61111697. The next prime is 61111711. The reversal of 61111709 is 90711116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46648900 + 14462809 = 6830^2 + 3803^2 .

It is a cyclic number.

It is not a de Polignac number, because 61111709 - 2¹⁶ = 61046173 is a prime.

Together with 61111711, 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 (61111769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30555854 + 30555855.

It is an arithmetic number, because the mean of its divisors is an integer number (30555855).

Almost surely, 2^61111709 is an apocalyptic number.

It is an amenable number.

61111709 is a deficient number, since it is larger than the sum of its proper divisors (1).

61111709 is an equidigital number, since it uses as much as digits as its factorization.

61111709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 26.

The square root of 61111709 is about 7817.3978407140. The cubic root of 61111709 is about 393.8898680392.

The spelling of 61111709 in words is "sixty-one million, one hundred eleven thousand, seven hundred nine".