19893131 has 2 divisors, whose sum is σ = 19893132. Its totient is φ = 19893130.

The previous prime is 19893127. The next prime is 19893151. The reversal of 19893131 is 13139891.

It is a weak prime.

It is an emirp because it is prime and its reverse (13139891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19893131 - 2² = 19893127 is a prime.

It is a super-2 number, since 2×19893131² = 791473321966322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19893091 and 19893100.

It is not a weakly prime, because it can be changed into another prime (19893121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9946565 + 9946566.

It is an arithmetic number, because the mean of its divisors is an integer number (9946566).

Almost surely, 2^19893131 is an apocalyptic number.

19893131 is a deficient number, since it is larger than the sum of its proper divisors (1).

19893131 is an equidigital number, since it uses as much as digits as its factorization.

19893131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 35.

The square root of 19893131 is about 4460.1716334688. The cubic root of 19893131 is about 270.9574194525.

The spelling of 19893131 in words is "nineteen million, eight hundred ninety-three thousand, one hundred thirty-one".