1247089620961 has 2 divisors, whose sum is σ = 1247089620962. Its totient is φ = 1247089620960.

The previous prime is 1247089620937. The next prime is 1247089620989. The reversal of 1247089620961 is 1690269807421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1142666929936 + 104422691025 = 1068956^2 + 323145^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247089620961 - 2³⁵ = 1212729882593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1247089620911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623544810480 + 623544810481.

It is an arithmetic number, because the mean of its divisors is an integer number (623544810481).

Almost surely, 2^{1247089620961} is an apocalyptic number.

It is an amenable number.

1247089620961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247089620961 is an equidigital number, since it uses as much as digits as its factorization.

1247089620961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 1247089620961 in words is "one trillion, two hundred forty-seven billion, eighty-nine million, six hundred twenty thousand, nine hundred sixty-one".