2143551541 has 4 divisors (see below), whose sum is σ = 2143744812. Its totient is φ = 2143358272.

The previous prime is 2143551511. The next prime is 2143551547. The reversal of 2143551541 is 1451553412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1570140625 + 573410916 = 39625^2 + 23946^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143551541 - 2¹⁹ = 2143027253 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 (2143551547) 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, 78916 + ... + 102541.

It is an arithmetic number, because the mean of its divisors is an integer number (535936203).

Almost surely, 2^2143551541 is an apocalyptic number.

It is an amenable number.

2143551541 is a deficient number, since it is larger than the sum of its proper divisors (193271).

2143551541 is a wasteful number, since it uses less digits than its factorization.

2143551541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193270.

The product of its digits is 12000, while the sum is 31.

The square root of 2143551541 is about 46298.5047382742. The cubic root of 2143551541 is about 1289.3712339516.

The spelling of 2143551541 in words is "two billion, one hundred forty-three million, five hundred fifty-one thousand, five hundred forty-one".