2891748857693 has 2 divisors, whose sum is σ = 2891748857694. Its totient is φ = 2891748857692.

The previous prime is 2891748857671. The next prime is 2891748857729. The reversal of 2891748857693 is 3967588471982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1453948816804 + 1437800040889 = 1205798^2 + 1199083^2 .

It is a cyclic number.

It is not a de Polignac number, because 2891748857693 - 2²⁴ = 2891732080477 is a prime.

It is a super-2 number, since 2×2891748857693² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2891748857593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1445874428846 + 1445874428847.

It is an arithmetic number, because the mean of its divisors is an integer number (1445874428847).

Almost surely, 2^{2891748857693} is an apocalyptic number.

It is an amenable number.

2891748857693 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891748857693 is an equidigital number, since it uses as much as digits as its factorization.

2891748857693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1463132160, while the sum is 77.

The spelling of 2891748857693 in words is "two trillion, eight hundred ninety-one billion, seven hundred forty-eight million, eight hundred fifty-seven thousand, six hundred ninety-three".