19994131 has 2 divisors, whose sum is σ = 19994132. Its totient is φ = 19994130.

The previous prime is 19994123. The next prime is 19994201. The reversal of 19994131 is 13149991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19994131 - 2³ = 19994123 is a prime.

It is a super-2 number, since 2×19994131² = 799530548890322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19994531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9997065 + 9997066.

It is an arithmetic number, because the mean of its divisors is an integer number (9997066).

Almost surely, 2^19994131 is an apocalyptic number.

19994131 is a deficient number, since it is larger than the sum of its proper divisors (1).

19994131 is an equidigital number, since it uses as much as digits as its factorization.

19994131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 37.

The square root of 19994131 is about 4471.4797327059. The cubic root of 19994131 is about 271.4152075336.

The spelling of 19994131 in words is "nineteen million, nine hundred ninety-four thousand, one hundred thirty-one".