1331231066 has 64 divisors (see below), whose sum is σ = 2325096576. Its totient is φ = 566092800.

The previous prime is 1331231059. The next prime is 1331231071. The reversal of 1331231066 is 6601321331.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2554886 + ... + 2555406.

It is an arithmetic number, because the mean of its divisors is an integer number (36329634).

Almost surely, 2^1331231066 is an apocalyptic number.

1331231066 is a deficient number, since it is larger than the sum of its proper divisors (993865510).

1331231066 is a wasteful number, since it uses less digits than its factorization.

1331231066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 1331231066 is about 36486.0393301328. The cubic root of 1331231066 is about 1100.0636508623.

Adding to 1331231066 its reverse (6601321331), we get a palindrome (7932552397).

The spelling of 1331231066 in words is "one billion, three hundred thirty-one million, two hundred thirty-one thousand, sixty-six".