891240373427 has 2 divisors, whose sum is σ = 891240373428. Its totient is φ = 891240373426.

The previous prime is 891240373411. The next prime is 891240373451. The reversal of 891240373427 is 724373042198.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 891240373427 - 2⁴ = 891240373411 is a prime.

It is not a weakly prime, because it can be changed into another prime (891240373927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445620186713 + 445620186714.

It is an arithmetic number, because the mean of its divisors is an integer number (445620186714).

Almost surely, 2^891240373427 is an apocalyptic number.

891240373427 is a deficient number, since it is larger than the sum of its proper divisors (1).

891240373427 is an equidigital number, since it uses as much as digits as its factorization.

891240373427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 50.

The spelling of 891240373427 in words is "eight hundred ninety-one billion, two hundred forty million, three hundred seventy-three thousand, four hundred twenty-seven".