1331478671 has 4 divisors (see below), whose sum is σ = 1389369072. Its totient is φ = 1273588272.

The previous prime is 1331478647. The next prime is 1331478677. The reversal of 1331478671 is 1768741331.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331478671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331478677) 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, 28945166 + ... + 28945211.

It is an arithmetic number, because the mean of its divisors is an integer number (347342268).

Almost surely, 2^1331478671 is an apocalyptic number.

1331478671 is a deficient number, since it is larger than the sum of its proper divisors (57890401).

1331478671 is an equidigital number, since it uses as much as digits as its factorization.

1331478671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57890400.

The product of its digits is 84672, while the sum is 41.

The square root of 1331478671 is about 36489.4323195086. The cubic root of 1331478671 is about 1100.1318494847.

The spelling of 1331478671 in words is "one billion, three hundred thirty-one million, four hundred seventy-eight thousand, six hundred seventy-one".