51616493 has 4 divisors (see below), whose sum is σ = 52117728. Its totient is φ = 51115260.

The previous prime is 51616447. The next prime is 51616501. The reversal of 51616493 is 39461615.

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: 39461615 = 5 ⋅7892323.

It is a cyclic number.

It is not a de Polignac number, because 51616493 - 2⁸ = 51616237 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 (51616093) 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, 250463 + ... + 250668.

It is an arithmetic number, because the mean of its divisors is an integer number (13029432).

Almost surely, 2^51616493 is an apocalyptic number.

It is an amenable number.

51616493 is a deficient number, since it is larger than the sum of its proper divisors (501235).

51616493 is a wasteful number, since it uses less digits than its factorization.

51616493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501234.

The product of its digits is 19440, while the sum is 35.

The square root of 51616493 is about 7184.4619144373. The cubic root of 51616493 is about 372.3312581964.

The spelling of 51616493 in words is "fifty-one million, six hundred sixteen thousand, four hundred ninety-three".