51520437 has 12 divisors (see below), whose sum is σ = 77654304. Its totient is φ = 32853480.

The previous prime is 51520423. The next prime is 51520439. The reversal of 51520437 is 73402515.

It is a happy number.

It is not a de Polignac number, because 51520437 - 2⁶ = 51520373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51520437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124239 + ... + 124652.

It is an arithmetic number, because the mean of its divisors is an integer number (6471192).

Almost surely, 2^51520437 is an apocalyptic number.

It is an amenable number.

51520437 is a deficient number, since it is larger than the sum of its proper divisors (26133867).

51520437 is a wasteful number, since it uses less digits than its factorization.

51520437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248920 (or 248917 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 51520437 is about 7177.7738192284. The cubic root of 51520437 is about 372.1001508009.

The spelling of 51520437 in words is "fifty-one million, five hundred twenty thousand, four hundred thirty-seven".