1209551864 has 16 divisors (see below), whose sum is σ = 2282357400. Its totient is φ = 600923232.

The previous prime is 1209551851. The next prime is 1209551891. The reversal of 1209551864 is 4681559021.

It is a congruent number.

It is an unprimeable number.

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, 480254 + ... + 482765.

Almost surely, 2^1209551864 is an apocalyptic number.

It is an amenable number.

1209551864 is a deficient number, since it is larger than the sum of its proper divisors (1072805536).

1209551864 is a wasteful number, since it uses less digits than its factorization.

1209551864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963182 (or 963178 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 1209551864 is about 34778.6121632247. The cubic root of 1209551864 is about 1065.4706682571.

The spelling of 1209551864 in words is "one billion, two hundred nine million, five hundred fifty-one thousand, eight hundred sixty-four".