20131919 has 2 divisors, whose sum is σ = 20131920. Its totient is φ = 20131918.

The previous prime is 20131907. The next prime is 20131931. The reversal of 20131919 is 91913102.

It is a balanced prime because it is at equal distance from previous prime (20131907) and next prime (20131931).

It is a cyclic number.

It is not a de Polignac number, because 20131919 - 2¹² = 20127823 is a prime.

It is a super-2 number, since 2×20131919² = 810588325245122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20131939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065959 + 10065960.

It is an arithmetic number, because the mean of its divisors is an integer number (10065960).

Almost surely, 2^20131919 is an apocalyptic number.

20131919 is a deficient number, since it is larger than the sum of its proper divisors (1).

20131919 is an equidigital number, since it uses as much as digits as its factorization.

20131919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 20131919 is about 4486.8607065520. The cubic root of 20131919 is about 272.0372597098.

The spelling of 20131919 in words is "twenty million, one hundred thirty-one thousand, nine hundred nineteen".