1248590989 has 4 divisors (see below), whose sum is σ = 1250038656. Its totient is φ = 1247143324.

The previous prime is 1248590983. The next prime is 1248591007. The reversal of 1248590989 is 9890958421.

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 1248590989 - 2⁹ = 1248590477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1248590983) 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, 722539 + ... + 724264.

It is an arithmetic number, because the mean of its divisors is an integer number (312509664).

Almost surely, 2^1248590989 is an apocalyptic number.

It is an amenable number.

1248590989 is a deficient number, since it is larger than the sum of its proper divisors (1447667).

1248590989 is an equidigital number, since it uses as much as digits as its factorization.

1248590989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447666.

The product of its (nonzero) digits is 1866240, while the sum is 55.

The square root of 1248590989 is about 35335.4070161927. The cubic root of 1248590989 is about 1076.8124432179.

The spelling of 1248590989 in words is "one billion, two hundred forty-eight million, five hundred ninety thousand, nine hundred eighty-nine".