51634613 has 4 divisors (see below), whose sum is σ = 51652608. Its totient is φ = 51616620.

The previous prime is 51634589. The next prime is 51634643. The reversal of 51634613 is 31643615.

It is a happy number.

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: 31643615 = 5 ⋅6328723.

It is a cyclic number.

It is not a de Polignac number, because 51634613 - 2¹⁸ = 51372469 is a prime.

It is a super-2 number, since 2×51634613² = 5332266519319538, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51634643) 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, 3623 + ... + 10788.

It is an arithmetic number, because the mean of its divisors is an integer number (12913152).

Almost surely, 2^51634613 is an apocalyptic number.

It is an amenable number.

51634613 is a deficient number, since it is larger than the sum of its proper divisors (17995).

51634613 is a wasteful number, since it uses less digits than its factorization.

51634613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17994.

The product of its digits is 6480, while the sum is 29.

The square root of 51634613 is about 7185.7228585578. The cubic root of 51634613 is about 372.3748221343.

The spelling of 51634613 in words is "fifty-one million, six hundred thirty-four thousand, six hundred thirteen".