1331669481 has 4 divisors (see below), whose sum is σ = 1775559312. Its totient is φ = 887779652.

The previous prime is 1331669477. The next prime is 1331669497. The reversal of 1331669481 is 1849661331.

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 1331669481 - 2² = 1331669477 is a prime.

It is a super-2 number, since 2×1331669481² = 3546687213253618722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1331669441) 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, 221944911 + ... + 221944916.

It is an arithmetic number, because the mean of its divisors is an integer number (443889828).

Almost surely, 2^1331669481 is an apocalyptic number.

It is an amenable number.

1331669481 is a deficient number, since it is larger than the sum of its proper divisors (443889831).

1331669481 is an equidigital number, since it uses as much as digits as its factorization.

1331669481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443889830.

The product of its digits is 93312, while the sum is 42.

The square root of 1331669481 is about 36492.0468184507. The cubic root of 1331669481 is about 1100.1843991140.

The spelling of 1331669481 in words is "one billion, three hundred thirty-one million, six hundred sixty-nine thousand, four hundred eighty-one".