61331486813 has 2 divisors, whose sum is σ = 61331486814. Its totient is φ = 61331486812.

The previous prime is 61331486807. The next prime is 61331486899. The reversal of 61331486813 is 31868413316.

61331486813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50543133124 + 10788353689 = 224818^2 + 103867^2 .

It is a cyclic number.

It is not a de Polignac number, because 61331486813 - 2²⁶ = 61264377949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61331480813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30665743406 + 30665743407.

It is an arithmetic number, because the mean of its divisors is an integer number (30665743407).

Almost surely, 2^61331486813 is an apocalyptic number.

It is an amenable number.

61331486813 is a deficient number, since it is larger than the sum of its proper divisors (1).

61331486813 is an equidigital number, since it uses as much as digits as its factorization.

61331486813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 44.

The spelling of 61331486813 in words is "sixty-one billion, three hundred thirty-one million, four hundred eighty-six thousand, eight hundred thirteen".