1331287505 has 8 divisors (see below), whose sum is σ = 1624622400. Its totient is φ = 1046978416.

The previous prime is 1331287501. The next prime is 1331287567. The reversal of 1331287505 is 5057821331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1331287505 - 2² = 1331287501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1331287501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2256125 + ... + 2256714.

It is an arithmetic number, because the mean of its divisors is an integer number (203077800).

Almost surely, 2^1331287505 is an apocalyptic number.

It is an amenable number.

1331287505 is a deficient number, since it is larger than the sum of its proper divisors (293334895).

1331287505 is an equidigital number, since it uses as much as digits as its factorization.

1331287505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4512903.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 1331287505 is about 36486.8127547474. The cubic root of 1331287505 is about 1100.0791967773.

The spelling of 1331287505 in words is "one billion, three hundred thirty-one million, two hundred eighty-seven thousand, five hundred five".