51478537 has 4 divisors (see below), whose sum is σ = 56158416. Its totient is φ = 46798660.

The previous prime is 51478519. The next prime is 51478591. The reversal of 51478537 is 73587415.

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 51478537 - 2⁷ = 51478409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51478537.

It is not an unprimeable number, because it can be changed into a prime (51478597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2339923 + ... + 2339944.

It is an arithmetic number, because the mean of its divisors is an integer number (14039604).

Almost surely, 2^51478537 is an apocalyptic number.

It is an amenable number.

51478537 is a deficient number, since it is larger than the sum of its proper divisors (4679879).

51478537 is a wasteful number, since it uses less digits than its factorization.

51478537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4679878.

The product of its digits is 117600, while the sum is 40.

The square root of 51478537 is about 7174.8544932981. The cubic root of 51478537 is about 371.9992508753. Note that the first 3 decimals are identical.

The spelling of 51478537 in words is "fifty-one million, four hundred seventy-eight thousand, five hundred thirty-seven".