1604219971 has 4 divisors (see below), whose sum is σ = 1631410200. Its totient is φ = 1577029744.

The previous prime is 1604219959. The next prime is 1604219987. The reversal of 1604219971 is 1799124061.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1604219971 - 2²⁵ = 1570665539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1604219371) 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, 13595026 + ... + 13595143.

It is an arithmetic number, because the mean of its divisors is an integer number (407852550).

Almost surely, 2^1604219971 is an apocalyptic number.

1604219971 is a deficient number, since it is larger than the sum of its proper divisors (27190229).

1604219971 is an equidigital number, since it uses as much as digits as its factorization.

1604219971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27190228.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 1604219971 is about 40052.7149017392. The cubic root of 1604219971 is about 1170.6344650956.

The spelling of 1604219971 in words is "one billion, six hundred four million, two hundred nineteen thousand, nine hundred seventy-one".