1331920500 has 48 divisors (see below), whose sum is σ = 3878556864. Its totient is φ = 355178400.

The previous prime is 1331920493. The next prime is 1331920517. The reversal of 1331920500 is 50291331.

It is a happy number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 442474 + ... + 445473.

It is an arithmetic number, because the mean of its divisors is an integer number (80803268).

Almost surely, 2^1331920500 is an apocalyptic number.

1331920500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331920500 is an abundant number, since it is smaller than the sum of its proper divisors (2546636364).

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

1331920500 is a wasteful number, since it uses less digits than its factorization.

1331920500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887969 (or 887957 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 1331920500 is about 36495.4860222466. The cubic root of 1331920500 is about 1100.2535228320.

The spelling of 1331920500 in words is "one billion, three hundred thirty-one million, nine hundred twenty thousand, five hundred".