1213611047557 has 2 divisors, whose sum is σ = 1213611047558. Its totient is φ = 1213611047556.

The previous prime is 1213611047531. The next prime is 1213611047569. The reversal of 1213611047557 is 7557401163121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 879695802241 + 333915245316 = 937921^2 + 577854^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213611047557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213611047527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606805523778 + 606805523779.

It is an arithmetic number, because the mean of its divisors is an integer number (606805523779).

Almost surely, 2^{1213611047557} is an apocalyptic number.

It is an amenable number.

1213611047557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213611047557 is an equidigital number, since it uses as much as digits as its factorization.

1213611047557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 43.

The spelling of 1213611047557 in words is "one trillion, two hundred thirteen billion, six hundred eleven million, forty-seven thousand, five hundred fifty-seven".