1331620506 has 64 divisors (see below), whose sum is σ = 3139637760. Its totient is φ = 416908800.

The previous prime is 1331620471. The next prime is 1331620547. The reversal of 1331620506 is 6050261331.

1331620506 is a `hidden beast` number, since 1 + 3 + 31 + 620 + 5 + 0 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1331620506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 565231 + ... + 567581.

It is an arithmetic number, because the mean of its divisors is an integer number (49056840).

Almost surely, 2^1331620506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1331620506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1569818880).

1331620506 is an abundant number, since it is smaller than the sum of its proper divisors (1808017254).

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

1331620506 is a wasteful number, since it uses less digits than its factorization.

1331620506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2996 (or 2990 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 1331620506 is about 36491.3757756542. The cubic root of 1331620506 is about 1100.1709117353.

Adding to 1331620506 its reverse (6050261331), we get a palindrome (7381881837).

The spelling of 1331620506 in words is "one billion, three hundred thirty-one million, six hundred twenty thousand, five hundred six".