2143381261 has 8 divisors (see below), whose sum is σ = 2528597504. Its totient is φ = 1777919760.

The previous prime is 2143381243. The next prime is 2143381277. The reversal of 2143381261 is 1621833412.

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 2143381261 - 2⁷ = 2143381133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143301261) 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, 4938450 + ... + 4938883.

It is an arithmetic number, because the mean of its divisors is an integer number (316074688).

Almost surely, 2^2143381261 is an apocalyptic number.

It is an amenable number.

2143381261 is a deficient number, since it is larger than the sum of its proper divisors (385216243).

2143381261 is an equidigital number, since it uses as much as digits as its factorization.

2143381261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9877371.

The product of its digits is 6912, while the sum is 31.

The square root of 2143381261 is about 46296.6657654739. The cubic root of 2143381261 is about 1289.3370912460.

The spelling of 2143381261 in words is "two billion, one hundred forty-three million, three hundred eighty-one thousand, two hundred sixty-one".