51550521 has 24 divisors (see below), whose sum is σ = 78410976. Its totient is φ = 29874240.

The previous prime is 51550517. The next prime is 51550529. The reversal of 51550521 is 12505515.

It is not a de Polignac number, because 51550521 - 2² = 51550517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51550491 and 51550500.

It is not an unprimeable number, because it can be changed into a prime (51550529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15981 + ... + 18933.

It is an arithmetic number, because the mean of its divisors is an integer number (3267124).

Almost surely, 2^51550521 is an apocalyptic number.

It is an amenable number.

51550521 is a deficient number, since it is larger than the sum of its proper divisors (26860455).

51550521 is a wasteful number, since it uses less digits than its factorization.

51550521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013 (or 2990 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 51550521 is about 7179.8691492255. The cubic root of 51550521 is about 372.1725627306.

The spelling of 51550521 in words is "fifty-one million, five hundred fifty thousand, five hundred twenty-one".