427238991331 has 2 divisors, whose sum is σ = 427238991332. Its totient is φ = 427238991330.

The previous prime is 427238991313. The next prime is 427238991353. The reversal of 427238991331 is 133199832724.

Together with previous prime (427238991313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 427238991331 - 2⁵ = 427238991299 is a prime.

It is a super-2 number, since 2×427238991331² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (427238991031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213619495665 + 213619495666.

It is an arithmetic number, because the mean of its divisors is an integer number (213619495666).

Almost surely, 2^427238991331 is an apocalyptic number.

427238991331 is a deficient number, since it is larger than the sum of its proper divisors (1).

427238991331 is an equidigital number, since it uses as much as digits as its factorization.

427238991331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 52.

The spelling of 427238991331 in words is "four hundred twenty-seven billion, two hundred thirty-eight million, nine hundred ninety-one thousand, three hundred thirty-one".