18491944141 has 4 divisors (see below), whose sum is σ = 20173029984. Its totient is φ = 16810858300.

The previous prime is 18491944139. The next prime is 18491944193. The reversal of 18491944141 is 14144919481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18491944141 - 2¹ = 18491944139 is a prime.

It is a super-2 number, since 2×18491944141² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18491944091 and 18491944100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18491944241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 840542905 + ... + 840542926.

It is an arithmetic number, because the mean of its divisors is an integer number (5043257496).

Almost surely, 2^18491944141 is an apocalyptic number.

18491944141 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18491944141 is a deficient number, since it is larger than the sum of its proper divisors (1681085843).

18491944141 is a wasteful number, since it uses less digits than its factorization.

18491944141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681085842.

The product of its digits is 165888, while the sum is 46.

The spelling of 18491944141 in words is "eighteen billion, four hundred ninety-one million, nine hundred forty-four thousand, one hundred forty-one".