61771559 has 2 divisors, whose sum is σ = 61771560. Its totient is φ = 61771558.

The previous prime is 61771547. The next prime is 61771573. The reversal of 61771559 is 95517716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61771559 - 2²⁰ = 60722983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61771529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30885779 + 30885780.

It is an arithmetic number, because the mean of its divisors is an integer number (30885780).

Almost surely, 2^61771559 is an apocalyptic number.

61771559 is a deficient number, since it is larger than the sum of its proper divisors (1).

61771559 is an equidigital number, since it uses as much as digits as its factorization.

61771559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66150, while the sum is 41.

The square root of 61771559 is about 7859.4884693598. The cubic root of 61771559 is about 395.3024634164.

The spelling of 61771559 in words is "sixty-one million, seven hundred seventy-one thousand, five hundred fifty-nine".