61111559 has 2 divisors, whose sum is σ = 61111560. Its totient is φ = 61111558.

The previous prime is 61111517. The next prime is 61111579. The reversal of 61111559 is 95511116.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61111559 - 2²⁴ = 44334343 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61111579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30555779 + 30555780.

It is an arithmetic number, because the mean of its divisors is an integer number (30555780).

Almost surely, 2^61111559 is an apocalyptic number.

61111559 is a deficient number, since it is larger than the sum of its proper divisors (1).

61111559 is an equidigital number, since it uses as much as digits as its factorization.

61111559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1350, while the sum is 29.

The square root of 61111559 is about 7817.3882467228. The cubic root of 61111559 is about 393.8895457686.

The spelling of 61111559 in words is "sixty-one million, one hundred eleven thousand, five hundred fifty-nine".