61555493 has 2 divisors, whose sum is σ = 61555494. Its totient is φ = 61555492.

The previous prime is 61555471. The next prime is 61555499. The reversal of 61555493 is 39455516.

61555493 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 can be written as a sum of positive squares in only one way, i.e., 37368769 + 24186724 = 6113^2 + 4918^2 .

It is a cyclic number.

It is not a de Polignac number, because 61555493 - 2⁸ = 61555237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61555499) 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, 30777746 + 30777747.

It is an arithmetic number, because the mean of its divisors is an integer number (30777747).

Almost surely, 2^61555493 is an apocalyptic number.

It is an amenable number.

61555493 is a deficient number, since it is larger than the sum of its proper divisors (1).

61555493 is an equidigital number, since it uses as much as digits as its factorization.

61555493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 38.

The square root of 61555493 is about 7845.7308773625. The cubic root of 61555493 is about 394.8410255956.

The spelling of 61555493 in words is "sixty-one million, five hundred fifty-five thousand, four hundred ninety-three".