20130491 has 2 divisors, whose sum is σ = 20130492. Its totient is φ = 20130490.

The previous prime is 20130469. The next prime is 20130503. The reversal of 20130491 is 19403102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20130491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20130391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065245 + 10065246.

It is an arithmetic number, because the mean of its divisors is an integer number (10065246).

Almost surely, 2^20130491 is an apocalyptic number.

20130491 is a deficient number, since it is larger than the sum of its proper divisors (1).

20130491 is an equidigital number, since it uses as much as digits as its factorization.

20130491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20130491 is about 4486.7015724249. The cubic root of 20130491 is about 272.0308274965.

Adding to 20130491 its reverse (19403102), we get a palindrome (39533593).

The spelling of 20130491 in words is "twenty million, one hundred thirty thousand, four hundred ninety-one".