61555523 has 2 divisors, whose sum is σ = 61555524. Its totient is φ = 61555522.

The previous prime is 61555499. The next prime is 61555537. The reversal of 61555523 is 32555516.

61555523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61555523 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61555523.

It is not a weakly prime, because it can be changed into another prime (61555583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30777761 + 30777762.

It is an arithmetic number, because the mean of its divisors is an integer number (30777762).

Almost surely, 2^61555523 is an apocalyptic number.

61555523 is a deficient number, since it is larger than the sum of its proper divisors (1).

61555523 is an equidigital number, since it uses as much as digits as its factorization.

61555523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22500, while the sum is 32.

The square root of 61555523 is about 7845.7327892301. The cubic root of 61555523 is about 394.8410897395.

The spelling of 61555523 in words is "sixty-one million, five hundred fifty-five thousand, five hundred twenty-three".