1321713175457 has 2 divisors, whose sum is σ = 1321713175458. Its totient is φ = 1321713175456.

The previous prime is 1321713175369. The next prime is 1321713175477. The reversal of 1321713175457 is 7545713171231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 771321306001 + 550391869456 = 878249^2 + 741884^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321713175457 - 2¹⁰ = 1321713174433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321713175477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660856587728 + 660856587729.

It is an arithmetic number, because the mean of its divisors is an integer number (660856587729).

Almost surely, 2^{1321713175457} is an apocalyptic number.

It is an amenable number.

1321713175457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321713175457 is an equidigital number, since it uses as much as digits as its factorization.

1321713175457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 617400, while the sum is 47.

The spelling of 1321713175457 in words is "one trillion, three hundred twenty-one billion, seven hundred thirteen million, one hundred seventy-five thousand, four hundred fifty-seven".