921306431 has 2 divisors, whose sum is σ = 921306432. Its totient is φ = 921306430.

The previous prime is 921306413. The next prime is 921306461. The reversal of 921306431 is 134603129.

Together with previous prime (921306413) 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 (134603129) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921306431 is a prime.

It is a super-2 number, since 2×921306431² = 1697611079603915522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 921306394 and 921306403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921306461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460653215 + 460653216.

It is an arithmetic number, because the mean of its divisors is an integer number (460653216).

Almost surely, 2^921306431 is an apocalyptic number.

921306431 is a deficient number, since it is larger than the sum of its proper divisors (1).

921306431 is an equidigital number, since it uses as much as digits as its factorization.

921306431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 921306431 is about 30353.0300134929. The cubic root of 921306431 is about 973.0489781122.

The spelling of 921306431 in words is "nine hundred twenty-one million, three hundred six thousand, four hundred thirty-one".