1917612981293 has 2 divisors, whose sum is σ = 1917612981294. Its totient is φ = 1917612981292.

The previous prime is 1917612981223. The next prime is 1917612981337. The reversal of 1917612981293 is 3921892167191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1777267592164 + 140345389129 = 1333142^2 + 374627^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1917612981293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1917612981223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958806490646 + 958806490647.

It is an arithmetic number, because the mean of its divisors is an integer number (958806490647).

Almost surely, 2^{1917612981293} is an apocalyptic number.

It is an amenable number.

1917612981293 is a deficient number, since it is larger than the sum of its proper divisors (1).

1917612981293 is an equidigital number, since it uses as much as digits as its factorization.

1917612981293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 59.

The spelling of 1917612981293 in words is "one trillion, nine hundred seventeen billion, six hundred twelve million, nine hundred eighty-one thousand, two hundred ninety-three".