1258764321 has 4 divisors (see below), whose sum is σ = 1678352432. Its totient is φ = 839176212.

The previous prime is 1258764317. The next prime is 1258764323. The reversal of 1258764321 is 1234678521.

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 not a de Polignac number, because 1258764321 - 2² = 1258764317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1258764321.

It is not an unprimeable number, because it can be changed into a prime (1258764323) 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, 209794051 + ... + 209794056.

It is an arithmetic number, because the mean of its divisors is an integer number (419588108).

Almost surely, 2^1258764321 is an apocalyptic number.

It is an amenable number.

1258764321 is a deficient number, since it is larger than the sum of its proper divisors (419588111).

1258764321 is an equidigital number, since it uses as much as digits as its factorization.

1258764321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419588110.

The product of its digits is 80640, while the sum is 39.

The square root of 1258764321 is about 35479.0687730104. The cubic root of 1258764321 is about 1079.7291047253.

The spelling of 1258764321 in words is "one billion, two hundred fifty-eight million, seven hundred sixty-four thousand, three hundred twenty-one".