18941915929 has 4 divisors (see below), whose sum is σ = 18942203700. Its totient is φ = 18941628160.

The previous prime is 18941915897. The next prime is 18941915969. The reversal of 18941915929 is 92951914981.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 369677529 + 18572238400 = 19227^2 + 136280^2 .

It is a cyclic number.

It is not a de Polignac number, because 18941915929 - 2⁵ = 18941915897 is a prime.

It is a super-2 number, since 2×18941915929² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18941915969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8997 + ... + 194845.

It is an arithmetic number, because the mean of its divisors is an integer number (4735550925).

Almost surely, 2^18941915929 is an apocalyptic number.

It is an amenable number.

18941915929 is a deficient number, since it is larger than the sum of its proper divisors (287771).

18941915929 is a wasteful number, since it uses less digits than its factorization.

18941915929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287770.

The product of its digits is 2099520, while the sum is 58.

The spelling of 18941915929 in words is "eighteen billion, nine hundred forty-one million, nine hundred fifteen thousand, nine hundred twenty-nine".