61718369 has 2 divisors, whose sum is σ = 61718370. Its totient is φ = 61718368.

The previous prime is 61718339. The next prime is 61718387. The reversal of 61718369 is 96381716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32341969 + 29376400 = 5687^2 + 5420^2 .

It is a cyclic number.

It is not a de Polignac number, because 61718369 - 2²⁴ = 44941153 is a prime.

It is a super-2 number, since 2×61718369² = 7618314144040322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61718339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30859184 + 30859185.

It is an arithmetic number, because the mean of its divisors is an integer number (30859185).

Almost surely, 2^61718369 is an apocalyptic number.

It is an amenable number.

61718369 is a deficient number, since it is larger than the sum of its proper divisors (1).

61718369 is an equidigital number, since it uses as much as digits as its factorization.

61718369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 61718369 is about 7856.1039326119. The cubic root of 61718369 is about 395.1889690279.

The spelling of 61718369 in words is "sixty-one million, seven hundred eighteen thousand, three hundred sixty-nine".