19316881 has 2 divisors, whose sum is σ = 19316882. Its totient is φ = 19316880.

The previous prime is 19316861. The next prime is 19316887. The reversal of 19316881 is 18861391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18662400 + 654481 = 4320^2 + 809^2 .

It is a cyclic number.

It is not a de Polignac number, because 19316881 - 2⁷ = 19316753 is a prime.

It is a super-2 number, since 2×19316881² = 746283783136322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19316881.

It is not a weakly prime, because it can be changed into another prime (19316887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9658440 + 9658441.

It is an arithmetic number, because the mean of its divisors is an integer number (9658441).

Almost surely, 2^19316881 is an apocalyptic number.

It is an amenable number.

19316881 is a deficient number, since it is larger than the sum of its proper divisors (1).

19316881 is an equidigital number, since it uses as much as digits as its factorization.

19316881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 37.

The square root of 19316881 is about 4395.0973823113. The cubic root of 19316881 is about 268.3154422271.

The spelling of 19316881 in words is "nineteen million, three hundred sixteen thousand, eight hundred eighty-one".