18882091381 has 2 divisors, whose sum is σ = 18882091382. Its totient is φ = 18882091380.

The previous prime is 18882091303. The next prime is 18882091409. The reversal of 18882091381 is 18319028881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14498327281 + 4383764100 = 120409^2 + 66210^2 .

It is an emirp because it is prime and its reverse (18319028881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18882091381 - 2²¹ = 18879994229 is a prime.

It is a super-2 number, since 2×18882091381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18882071381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9441045690 + 9441045691.

It is an arithmetic number, because the mean of its divisors is an integer number (9441045691).

Almost surely, 2^18882091381 is an apocalyptic number.

It is an amenable number.

18882091381 is a deficient number, since it is larger than the sum of its proper divisors (1).

18882091381 is an equidigital number, since it uses as much as digits as its factorization.

18882091381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 49.

The spelling of 18882091381 in words is "eighteen billion, eight hundred eighty-two million, ninety-one thousand, three hundred eighty-one".