1264571321 has 8 divisors (see below), whose sum is σ = 1362124680. Its totient is φ = 1167057792.

The previous prime is 1264571309. The next prime is 1264571351. The reversal of 1264571321 is 1231754621.

It can be written as a sum of positive squares in 4 ways, for example, as 54922921 + 1209648400 = 7411^2 + 34780^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1264571321 - 2³⁰ = 190829497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264571351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106541 + ... + 117813.

It is an arithmetic number, because the mean of its divisors is an integer number (170265585).

Almost surely, 2^1264571321 is an apocalyptic number.

It is an amenable number.

1264571321 is a deficient number, since it is larger than the sum of its proper divisors (97553359).

1264571321 is a wasteful number, since it uses less digits than its factorization.

1264571321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19915.

The product of its digits is 10080, while the sum is 32.

The square root of 1264571321 is about 35560.8115908510. The cubic root of 1264571321 is about 1081.3869130379.

The spelling of 1264571321 in words is "one billion, two hundred sixty-four million, five hundred seventy-one thousand, three hundred twenty-one".