51525561 has 16 divisors (see below), whose sum is σ = 70600320. Its totient is φ = 33406080.

The previous prime is 51525557. The next prime is 51525569. The reversal of 51525561 is 16552515.

It is not a de Polignac number, because 51525561 - 2² = 51525557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51525569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62196 + ... + 63018.

It is an arithmetic number, because the mean of its divisors is an integer number (4412520).

Almost surely, 2^51525561 is an apocalyptic number.

It is an amenable number.

51525561 is a deficient number, since it is larger than the sum of its proper divisors (19074759).

51525561 is a wasteful number, since it uses less digits than its factorization.

51525561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376.

The product of its digits is 7500, while the sum is 30.

The square root of 51525561 is about 7178.1307455354. The cubic root of 51525561 is about 372.1124862163.

The spelling of 51525561 in words is "fifty-one million, five hundred twenty-five thousand, five hundred sixty-one".