1881912493 has 2 divisors, whose sum is σ = 1881912494. Its totient is φ = 1881912492.

The previous prime is 1881912451. The next prime is 1881912517. The reversal of 1881912493 is 3942191881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1874283849 + 7628644 = 43293^2 + 2762^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1881912493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1881912413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940956246 + 940956247.

It is an arithmetic number, because the mean of its divisors is an integer number (940956247).

Almost surely, 2^1881912493 is an apocalyptic number.

It is an amenable number.

1881912493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881912493 is an equidigital number, since it uses as much as digits as its factorization.

1881912493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 46.

The square root of 1881912493 is about 43381.0153523405. The cubic root of 1881912493 is about 1234.6195275499.

The spelling of 1881912493 in words is "one billion, eight hundred eighty-one million, nine hundred twelve thousand, four hundred ninety-three".