51537021 has 4 divisors (see below), whose sum is σ = 68716032. Its totient is φ = 34358012.

The previous prime is 51537019. The next prime is 51537029. The reversal of 51537021 is 12073515.

51537021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 51537021 - 2¹ = 51537019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51536982 and 51537000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51537029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8589501 + ... + 8589506.

It is an arithmetic number, because the mean of its divisors is an integer number (17179008).

Almost surely, 2^51537021 is an apocalyptic number.

It is an amenable number.

51537021 is a deficient number, since it is larger than the sum of its proper divisors (17179011).

51537021 is a wasteful number, since it uses less digits than its factorization.

51537021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17179010.

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 51537021 is about 7178.9289591136. The cubic root of 51537021 is about 372.1400718320.

The spelling of 51537021 in words is "fifty-one million, five hundred thirty-seven thousand, twenty-one".