19130861 has 2 divisors, whose sum is σ = 19130862. Its totient is φ = 19130860.

The previous prime is 19130857. The next prime is 19130863. The reversal of 19130861 is 16803191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18966025 + 164836 = 4355^2 + 406^2 .

It is a cyclic number.

It is not a de Polignac number, because 19130861 - 2² = 19130857 is a prime.

Together with 19130863, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19130863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9565430 + 9565431.

It is an arithmetic number, because the mean of its divisors is an integer number (9565431).

Almost surely, 2^19130861 is an apocalyptic number.

It is an amenable number.

19130861 is a deficient number, since it is larger than the sum of its proper divisors (1).

19130861 is an equidigital number, since it uses as much as digits as its factorization.

19130861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 19130861 is about 4373.8839719407. The cubic root of 19130861 is about 267.4513773098.

It can be divided in two parts, 19130 and 861, that multiplied together give a triangular number (16470930 = T₅₇₃₉).

The spelling of 19130861 in words is "nineteen million, one hundred thirty thousand, eight hundred sixty-one".