19931481 has 16 divisors (see below), whose sum is σ = 30481920. Its totient is φ = 12858480.

The previous prime is 19931459. The next prime is 19931521. The reversal of 19931481 is 18413991.

It is not a de Polignac number, because 19931481 - 2²² = 15737177 is a prime.

It is a super-2 number, since 2×19931481² = 794527869706722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19932481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11070 + ... + 12743.

It is an arithmetic number, because the mean of its divisors is an integer number (1905120).

Almost surely, 2^19931481 is an apocalyptic number.

It is an amenable number.

19931481 is a deficient number, since it is larger than the sum of its proper divisors (10550439).

19931481 is a wasteful number, since it uses less digits than its factorization.

19931481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23853 (or 23847 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 19931481 is about 4464.4687253916. The cubic root of 19931481 is about 271.1314250222.

The spelling of 19931481 in words is "nineteen million, nine hundred thirty-one thousand, four hundred eighty-one".