51634513 has 4 divisors (see below), whose sum is σ = 59010880. Its totient is φ = 44258148.

The previous prime is 51634483. The next prime is 51634523. The reversal of 51634513 is 31543615.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31543615 = 5 ⋅6308723.

It is a cyclic number.

It is not a de Polignac number, because 51634513 - 2⁵ = 51634481 is a prime.

It is a super-2 number, since 2×51634513² = 5332245865494338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51634523) 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, 3688173 + ... + 3688186.

It is an arithmetic number, because the mean of its divisors is an integer number (14752720).

Almost surely, 2^51634513 is an apocalyptic number.

It is an amenable number.

51634513 is a deficient number, since it is larger than the sum of its proper divisors (7376367).

51634513 is an equidigital number, since it uses as much as digits as its factorization.

51634513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7376366.

The product of its digits is 5400, while the sum is 28.

The square root of 51634513 is about 7185.7159003122. The cubic root of 51634513 is about 372.3745817431.

The spelling of 51634513 in words is "fifty-one million, six hundred thirty-four thousand, five hundred thirteen".