1321795851 has 16 divisors (see below), whose sum is σ = 1779009024. Its totient is φ = 872925984.

The previous prime is 1321795841. The next prime is 1321795861. The reversal of 1321795851 is 1585971231.

It is an interprime number because it is at equal distance from previous prime (1321795841) and next prime (1321795861).

It is not a de Polignac number, because 1321795851 - 2²⁹ = 784924939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321795841) 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, 150750 + ... + 159276.

It is an arithmetic number, because the mean of its divisors is an integer number (111188064).

Almost surely, 2^1321795851 is an apocalyptic number.

1321795851 is a deficient number, since it is larger than the sum of its proper divisors (457213173).

1321795851 is a wasteful number, since it uses less digits than its factorization.

1321795851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9010.

The product of its digits is 75600, while the sum is 42.

The square root of 1321795851 is about 36356.5104348588. The cubic root of 1321795851 is about 1097.4585545168.

The spelling of 1321795851 in words is "one billion, three hundred twenty-one million, seven hundred ninety-five thousand, eight hundred fifty-one".