19125881 has 2 divisors, whose sum is σ = 19125882. Its totient is φ = 19125880.

The previous prime is 19125863. The next prime is 19125889. The reversal of 19125881 is 18852191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19009600 + 116281 = 4360^2 + 341^2 .

It is an emirp because it is prime and its reverse (18852191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19125881 - 2¹⁸ = 18863737 is a prime.

It is a super-2 number, since 2×19125881² = 731598648052322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19125889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9562940 + 9562941.

It is an arithmetic number, because the mean of its divisors is an integer number (9562941).

Almost surely, 2^19125881 is an apocalyptic number.

It is an amenable number.

19125881 is a deficient number, since it is larger than the sum of its proper divisors (1).

19125881 is an equidigital number, since it uses as much as digits as its factorization.

19125881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 35.

The square root of 19125881 is about 4373.3146468097. The cubic root of 19125881 is about 267.4281683274.

The spelling of 19125881 in words is "nineteen million, one hundred twenty-five thousand, eight hundred eighty-one".