61779911 has 2 divisors, whose sum is σ = 61779912. Its totient is φ = 61779910.

The previous prime is 61779877. The next prime is 61779917. The reversal of 61779911 is 11997716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61779911 - 2⁶ = 61779847 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 (61779917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30889955 + 30889956.

It is an arithmetic number, because the mean of its divisors is an integer number (30889956).

Almost surely, 2^61779911 is an apocalyptic number.

61779911 is a deficient number, since it is larger than the sum of its proper divisors (1).

61779911 is an equidigital number, since it uses as much as digits as its factorization.

61779911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 41.

The square root of 61779911 is about 7860.0197836901. The cubic root of 61779911 is about 395.3202786129.

The spelling of 61779911 in words is "sixty-one million, seven hundred seventy-nine thousand, nine hundred eleven".