19431081 has 12 divisors (see below), whose sum is σ = 28125552. Its totient is φ = 12927096.

The previous prime is 19431059. The next prime is 19431101. The reversal of 19431081 is 18013491.

It is not a de Polignac number, because 19431081 - 2⁷ = 19430953 is a prime.

It is a super-2 number, since 2×19431081² = 755133817657122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19431011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2950 + ... + 6896.

It is an arithmetic number, because the mean of its divisors is an integer number (2343796).

Almost surely, 2^19431081 is an apocalyptic number.

It is an amenable number.

19431081 is a deficient number, since it is larger than the sum of its proper divisors (8694471).

19431081 is a wasteful number, since it uses less digits than its factorization.

19431081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500 (or 4497 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 19431081 is about 4408.0699858328. The cubic root of 19431081 is about 268.8431574651.

The spelling of 19431081 in words is "nineteen million, four hundred thirty-one thousand, eighty-one".