1290855089 has 4 divisors (see below), whose sum is σ = 1290931824. Its totient is φ = 1290778356.

The previous prime is 1290855073. The next prime is 1290855103. The reversal of 1290855089 is 9805580921.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9805580921 = 307 ⋅31940003.

It is a cyclic number.

It is not a de Polignac number, because 1290855089 - 2⁴ = 1290855073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1290855389) 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, 1007 + ... + 50820.

It is an arithmetic number, because the mean of its divisors is an integer number (322732956).

Almost surely, 2^1290855089 is an apocalyptic number.

It is an amenable number.

1290855089 is a deficient number, since it is larger than the sum of its proper divisors (76735).

1290855089 is an equidigital number, since it uses as much as digits as its factorization.

1290855089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76734.

The product of its (nonzero) digits is 259200, while the sum is 47.

The square root of 1290855089 is about 35928.4718433724. The cubic root of 1290855089 is about 1088.8277071926.

The spelling of 1290855089 in words is "one billion, two hundred ninety million, eight hundred fifty-five thousand, eighty-nine".