1820975880391 has 2 divisors, whose sum is σ = 1820975880392. Its totient is φ = 1820975880390.

The previous prime is 1820975880343. The next prime is 1820975880413. The reversal of 1820975880391 is 1930885790281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1820975880391 - 2⁷ = 1820975880263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820975880331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910487940195 + 910487940196.

It is an arithmetic number, because the mean of its divisors is an integer number (910487940196).

Almost surely, 2^{1820975880391} is an apocalyptic number.

1820975880391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820975880391 is an equidigital number, since it uses as much as digits as its factorization.

1820975880391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 61.

The spelling of 1820975880391 in words is "one trillion, eight hundred twenty billion, nine hundred seventy-five million, eight hundred eighty thousand, three hundred ninety-one".