1321675861 has 24 divisors (see below), whose sum is σ = 1490791680. Its totient is φ = 1170317280.

The previous prime is 1321675843. The next prime is 1321675867. The reversal of 1321675861 is 1685761231.

It is a happy number.

It is not a de Polignac number, because 1321675861 - 2¹¹ = 1321673813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321675867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1574880 + ... + 1575718.

It is an arithmetic number, because the mean of its divisors is an integer number (62116320).

Almost surely, 2^1321675861 is an apocalyptic number.

1321675861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321675861 is a deficient number, since it is larger than the sum of its proper divisors (169115819).

1321675861 is a wasteful number, since it uses less digits than its factorization.

1321675861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185 (or 1174 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 1321675861 is about 36354.8602115316. The cubic root of 1321675861 is about 1097.4253451432.

The spelling of 1321675861 in words is "one billion, three hundred twenty-one million, six hundred seventy-five thousand, eight hundred sixty-one".