2143555651 has 4 divisors (see below), whose sum is σ = 2144280600. Its totient is φ = 2142830704.

The previous prime is 2143555639. The next prime is 2143555681. The reversal of 2143555651 is 1565553412.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2143555651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2143555651.

It is not an unprimeable number, because it can be changed into a prime (2143555681) 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, 358021 + ... + 363958.

It is an arithmetic number, because the mean of its divisors is an integer number (536070150).

Almost surely, 2^2143555651 is an apocalyptic number.

2143555651 is a deficient number, since it is larger than the sum of its proper divisors (724949).

2143555651 is an equidigital number, since it uses as much as digits as its factorization.

2143555651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724948.

The product of its digits is 90000, while the sum is 37.

The square root of 2143555651 is about 46298.5491241356. The cubic root of 2143555651 is about 1289.3720580221.

The spelling of 2143555651 in words is "two billion, one hundred forty-three million, five hundred fifty-five thousand, six hundred fifty-one".