51511849 has 4 divisors (see below), whose sum is σ = 52237440. Its totient is φ = 50786260.

The previous prime is 51511847. The next prime is 51511861. The reversal of 51511849 is 94811515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51511849 - 2¹ = 51511847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51511847) 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, 362689 + ... + 362830.

It is an arithmetic number, because the mean of its divisors is an integer number (13059360).

Almost surely, 2^51511849 is an apocalyptic number.

It is an amenable number.

51511849 is a deficient number, since it is larger than the sum of its proper divisors (725591).

51511849 is an equidigital number, since it uses as much as digits as its factorization.

51511849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725590.

The product of its digits is 7200, while the sum is 34.

The square root of 51511849 is about 7177.1755586721. The cubic root of 51511849 is about 372.0794743868.

The spelling of 51511849 in words is "fifty-one million, five hundred eleven thousand, eight hundred forty-nine".