8189151421 has 4 divisors (see below), whose sum is σ = 8933619744. Its totient is φ = 7444683100.

The previous prime is 8189151409. The next prime is 8189151427. The reversal of 8189151421 is 1241519818.

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 8189151421 - 2⁹ = 8189150909 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8189151427) 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, 372234145 + ... + 372234166.

It is an arithmetic number, because the mean of its divisors is an integer number (2233404936).

Almost surely, 2^8189151421 is an apocalyptic number.

It is an amenable number.

8189151421 is a deficient number, since it is larger than the sum of its proper divisors (744468323).

8189151421 is a wasteful number, since it uses less digits than its factorization.

8189151421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744468322.

The product of its digits is 23040, while the sum is 40.

The square root of 8189151421 is about 90493.9302992195. The cubic root of 8189151421 is about 2015.6399948891.

The spelling of 8189151421 in words is "eight billion, one hundred eighty-nine million, one hundred fifty-one thousand, four hundred twenty-one".