1971328069 has 8 divisors (see below), whose sum is σ = 2054827808. Its totient is φ = 1889418960.

The previous prime is 1971328063. The next prime is 1971328081. The reversal of 1971328069 is 9608231791.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1971328069 - 2⁹ = 1971327557 is a prime.

It is a super-2 number, since 2×1971328069² = 7772268711254537522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971328063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395127 + ... + 400084.

It is an arithmetic number, because the mean of its divisors is an integer number (256853476).

Almost surely, 2^1971328069 is an apocalyptic number.

It is an amenable number.

1971328069 is a deficient number, since it is larger than the sum of its proper divisors (83499739).

1971328069 is an equidigital number, since it uses as much as digits as its factorization.

1971328069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795315.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1971328069 is about 44399.6404152106. The cubic root of 1971328069 is about 1253.8713193185.

The spelling of 1971328069 in words is "one billion, nine hundred seventy-one million, three hundred twenty-eight thousand, sixty-nine".