61544351291 has 2 divisors, whose sum is σ = 61544351292. Its totient is φ = 61544351290.

The previous prime is 61544351227. The next prime is 61544351293. The reversal of 61544351291 is 19215344516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61544351291 - 2⁶ = 61544351227 is a prime.

Together with 61544351293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61544351293) 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, 30772175645 + 30772175646.

It is an arithmetic number, because the mean of its divisors is an integer number (30772175646).

Almost surely, 2^61544351291 is an apocalyptic number.

61544351291 is a deficient number, since it is larger than the sum of its proper divisors (1).

61544351291 is an equidigital number, since it uses as much as digits as its factorization.

61544351291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 41.

The spelling of 61544351291 in words is "sixty-one billion, five hundred forty-four million, three hundred fifty-one thousand, two hundred ninety-one".