1351113712561 has 2 divisors, whose sum is σ = 1351113712562. Its totient is φ = 1351113712560.

The previous prime is 1351113712537. The next prime is 1351113712601. The reversal of 1351113712561 is 1652173111531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 822830410000 + 528283302561 = 907100^2 + 726831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1351113712561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1351113712561.

It is not a weakly prime, because it can be changed into another prime (1351113712661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675556856280 + 675556856281.

It is an arithmetic number, because the mean of its divisors is an integer number (675556856281).

Almost surely, 2^{1351113712561} is an apocalyptic number.

It is an amenable number.

1351113712561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351113712561 is an equidigital number, since it uses as much as digits as its factorization.

1351113712561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 37.

The spelling of 1351113712561 in words is "one trillion, three hundred fifty-one billion, one hundred thirteen million, seven hundred twelve thousand, five hundred sixty-one".