385521431 has 2 divisors, whose sum is σ = 385521432. Its totient is φ = 385521430.

The previous prime is 385521413. The next prime is 385521473. The reversal of 385521431 is 134125583.

Together with previous prime (385521413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (134125583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 385521431 - 2²² = 381327127 is a prime.

It is a super-2 number, since 2×385521431² = 297253547520575522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385521491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192760715 + 192760716.

It is an arithmetic number, because the mean of its divisors is an integer number (192760716).

Almost surely, 2^385521431 is an apocalyptic number.

385521431 is a deficient number, since it is larger than the sum of its proper divisors (1).

385521431 is an equidigital number, since it uses as much as digits as its factorization.

385521431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 32.

The square root of 385521431 is about 19634.6996666616. The cubic root of 385521431 is about 727.8069108880.

The spelling of 385521431 in words is "three hundred eighty-five million, five hundred twenty-one thousand, four hundred thirty-one".