1290044661 has 4 divisors (see below), whose sum is σ = 1720059552. Its totient is φ = 860029772.

The previous prime is 1290044659. The next prime is 1290044699. The reversal of 1290044661 is 1664400921.

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 1290044661 - 2¹ = 1290044659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290044621) 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, 215007441 + ... + 215007446.

It is an arithmetic number, because the mean of its divisors is an integer number (430014888).

Almost surely, 2^1290044661 is an apocalyptic number.

It is an amenable number.

1290044661 is a deficient number, since it is larger than the sum of its proper divisors (430014891).

1290044661 is an equidigital number, since it uses as much as digits as its factorization.

1290044661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430014890.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1290044661 is about 35917.1917192867. The cubic root of 1290044661 is about 1088.5997959422.

The spelling of 1290044661 in words is "one billion, two hundred ninety million, forty-four thousand, six hundred sixty-one".