1248978289 has 16 divisors (see below), whose sum is σ = 1371359808. Its totient is φ = 1130513472.

The previous prime is 1248978217. The next prime is 1248978323. The reversal of 1248978289 is 9828798421.

It is a cyclic number.

It is not a de Polignac number, because 1248978289 - 2⁷ = 1248978161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1248978589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194559 + ... + 200875.

It is an arithmetic number, because the mean of its divisors is an integer number (85709988).

Almost surely, 2^1248978289 is an apocalyptic number.

It is an amenable number.

1248978289 is a deficient number, since it is larger than the sum of its proper divisors (122381519).

1248978289 is a wasteful number, since it uses less digits than its factorization.

1248978289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6624.

The product of its digits is 4644864, while the sum is 58.

The square root of 1248978289 is about 35340.8869300135. The cubic root of 1248978289 is about 1076.9237703990.

The spelling of 1248978289 in words is "one billion, two hundred forty-eight million, nine hundred seventy-eight thousand, two hundred eighty-nine".