51521559 has 24 divisors (see below), whose sum is σ = 73316592. Its totient is φ = 32175360.

The previous prime is 51521557. The next prime is 51521563. The reversal of 51521559 is 95512515.

It is not a de Polignac number, because 51521559 - 2¹ = 51521557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51521551) 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, 122169 + ... + 122589.

It is an arithmetic number, because the mean of its divisors is an integer number (3054858).

Almost surely, 2^51521559 is an apocalyptic number.

51521559 is a deficient number, since it is larger than the sum of its proper divisors (21795033).

51521559 is a wasteful number, since it uses less digits than its factorization.

51521559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575 (or 556 counting only the distinct ones).

The product of its digits is 11250, while the sum is 33.

The square root of 51521559 is about 7177.8519767407. The cubic root of 51521559 is about 372.1028519513.

The spelling of 51521559 in words is "fifty-one million, five hundred twenty-one thousand, five hundred fifty-nine".