51361519 has 4 divisors (see below), whose sum is σ = 56030760. Its totient is φ = 46692280.

The previous prime is 51361511. The next prime is 51361537. The reversal of 51361519 is 91516315.

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

It is a cyclic number.

It is not a de Polignac number, because 51361519 - 2³ = 51361511 is a prime.

It is a super-2 number, since 2×51361519² = 5276011267974722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51361511) 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, 2334604 + ... + 2334625.

It is an arithmetic number, because the mean of its divisors is an integer number (14007690).

Almost surely, 2^51361519 is an apocalyptic number.

51361519 is a deficient number, since it is larger than the sum of its proper divisors (4669241).

51361519 is a wasteful number, since it uses less digits than its factorization.

51361519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4669240.

The product of its digits is 4050, while the sum is 31.

The square root of 51361519 is about 7166.6951239745. The cubic root of 51361519 is about 371.7171680479.

The spelling of 51361519 in words is "fifty-one million, three hundred sixty-one thousand, five hundred nineteen".