2151743813 has 4 divisors (see below), whose sum is σ = 2151921900. Its totient is φ = 2151565728.

The previous prime is 2151743807. The next prime is 2151743819. The reversal of 2151743813 is 3183471512.

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

It is an interprime number because it is at equal distance from previous prime (2151743807) and next prime (2151743819).

It can be written as a sum of positive squares in 2 ways, for example, as 1853905249 + 297838564 = 43057^2 + 17258^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151743813 - 2⁸ = 2151743557 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 (2151743819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69488 + ... + 95561.

It is an arithmetic number, because the mean of its divisors is an integer number (537980475).

Almost surely, 2^2151743813 is an apocalyptic number.

It is an amenable number.

2151743813 is a deficient number, since it is larger than the sum of its proper divisors (178087).

2151743813 is a wasteful number, since it uses less digits than its factorization.

2151743813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178086.

The product of its digits is 20160, while the sum is 35.

The square root of 2151743813 is about 46386.8926853265. The cubic root of 2151743813 is about 1291.0117281926.

The spelling of 2151743813 in words is "two billion, one hundred fifty-one million, seven hundred forty-three thousand, eight hundred thirteen".