51658445 has 4 divisors (see below), whose sum is σ = 61990140. Its totient is φ = 41326752.

The previous prime is 51658429. The next prime is 51658457. The reversal of 51658445 is 54485615.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18088009 + 33570436 = 4253^2 + 5794^2 .

It is a cyclic number.

It is not a de Polignac number, because 51658445 - 2⁴ = 51658429 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51658399 and 51658408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5165840 + ... + 5165849.

It is an arithmetic number, because the mean of its divisors is an integer number (15497535).

Almost surely, 2^51658445 is an apocalyptic number.

It is an amenable number.

51658445 is a deficient number, since it is larger than the sum of its proper divisors (10331695).

51658445 is a wasteful number, since it uses less digits than its factorization.

51658445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10331694.

The product of its digits is 96000, while the sum is 38.

The square root of 51658445 is about 7187.3809555359. The cubic root of 51658445 is about 372.4321032955.

The spelling of 51658445 in words is "fifty-one million, six hundred fifty-eight thousand, four hundred forty-five".