51520545 has 12 divisors (see below), whose sum is σ = 89302356. Its totient is φ = 27477600.

The previous prime is 51520499. The next prime is 51520583. The reversal of 51520545 is 54502515.

It can be written as a sum of positive squares in 2 ways, for example, as 41177889 + 10342656 = 6417^2 + 3216^2 .

It is not a de Polignac number, because 51520545 - 2⁹ = 51520033 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 572406 + ... + 572495.

It is an arithmetic number, because the mean of its divisors is an integer number (7441863).

Almost surely, 2^51520545 is an apocalyptic number.

It is an amenable number.

51520545 is a deficient number, since it is larger than the sum of its proper divisors (37781811).

51520545 is a wasteful number, since it uses less digits than its factorization.

51520545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144912 (or 1144909 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 51520545 is about 7177.7813424484. The cubic root of 51520545 is about 372.1004108064.

It can be divided in two parts, 515205 and 45, that multiplied together give a square (23184225 = 4815²).

The spelling of 51520545 in words is "fifty-one million, five hundred twenty thousand, five hundred forty-five".