1331231208 has 16 divisors (see below), whose sum is σ = 3328078080. Its totient is φ = 443743728.

The previous prime is 1331231197. The next prime is 1331231261. The reversal of 1331231208 is 8021321331.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 55467967 = 1331231208 / (1 + 3 + 3 + 1 + 2 + 3 + 1 + 2 + 0 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27733960 + ... + 27734007.

It is an arithmetic number, because the mean of its divisors is an integer number (208004880).

Almost surely, 2^1331231208 is an apocalyptic number.

It is an amenable number.

1331231208 is an abundant number, since it is smaller than the sum of its proper divisors (1996846872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1331231208 is a wasteful number, since it uses less digits than its factorization.

1331231208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55467976 (or 55467972 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1331231208 is about 36486.0412760826. The cubic root of 1331231208 is about 1100.0636899762.

Adding to 1331231208 its reverse (8021321331), we get a palindrome (9352552539).

The spelling of 1331231208 in words is "one billion, three hundred thirty-one million, two hundred thirty-one thousand, two hundred eight".