51643357 has 4 divisors (see below), whose sum is σ = 51710940. Its totient is φ = 51575776.

The previous prime is 51643351. The next prime is 51643367. The reversal of 51643357 is 75334615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75334615 = 5 ⋅15066923.

It can be written as a sum of positive squares in 2 ways, for example, as 3048516 + 48594841 = 1746^2 + 6971^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51643357 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 (51643351) 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, 32632 + ... + 34177.

It is an arithmetic number, because the mean of its divisors is an integer number (12927735).

Almost surely, 2^51643357 is an apocalyptic number.

It is an amenable number.

51643357 is a deficient number, since it is larger than the sum of its proper divisors (67583).

51643357 is an equidigital number, since it uses as much as digits as its factorization.

51643357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67582.

The product of its digits is 37800, while the sum is 34.

The square root of 51643357 is about 7186.3312614992. The cubic root of 51643357 is about 372.3958407332.

The spelling of 51643357 in words is "fifty-one million, six hundred forty-three thousand, three hundred fifty-seven".