1320002581 has 4 divisors (see below), whose sum is σ = 1323065664. Its totient is φ = 1316939500.

The previous prime is 1320002527. The next prime is 1320002603. The reversal of 1320002581 is 1852000231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1320002581 - 2²¹ = 1317905429 is a prime.

It is a super-2 number, since 2×1320002581² = 3484813627693323122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320002081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1530895 + ... + 1531756.

It is an arithmetic number, because the mean of its divisors is an integer number (330766416).

Almost surely, 2^1320002581 is an apocalyptic number.

It is an amenable number.

1320002581 is a deficient number, since it is larger than the sum of its proper divisors (3063083).

1320002581 is an equidigital number, since it uses as much as digits as its factorization.

1320002581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3063082.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1320002581 is about 36331.8397689960. The cubic root of 1320002581 is about 1096.9620254500.

The spelling of 1320002581 in words is "one billion, three hundred twenty million, two thousand, five hundred eighty-one".