1290328081 has 4 divisors (see below), whose sum is σ = 1474660672. Its totient is φ = 1105995492.

The previous prime is 1290328031. The next prime is 1290328147. The reversal of 1290328081 is 1808230921.

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 not a de Polignac number, because 1290328081 - 2⁷ = 1290327953 is a prime.

It is a super-2 number, since 2×1290328081² = 3329893113234285122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1290328021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92166285 + ... + 92166298.

It is an arithmetic number, because the mean of its divisors is an integer number (368665168).

Almost surely, 2^1290328081 is an apocalyptic number.

It is an amenable number.

1290328081 is a deficient number, since it is larger than the sum of its proper divisors (184332591).

1290328081 is an equidigital number, since it uses as much as digits as its factorization.

1290328081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184332590.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 1290328081 is about 35921.1369669725. The cubic root of 1290328081 is about 1088.6795111055.

The spelling of 1290328081 in words is "one billion, two hundred ninety million, three hundred twenty-eight thousand, eighty-one".