51615545 has 16 divisors (see below), whose sum is σ = 63011520. Its totient is φ = 40584000.

The previous prime is 51615511. The next prime is 51615547. The reversal of 51615545 is 54551615.

It is not a de Polignac number, because 51615545 - 2¹² = 51611449 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51615547) 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, 90110 + ... + 90680.

It is an arithmetic number, because the mean of its divisors is an integer number (3938220).

Almost surely, 2^51615545 is an apocalyptic number.

It is an amenable number.

51615545 is a deficient number, since it is larger than the sum of its proper divisors (11395975).

51615545 is a wasteful number, since it uses less digits than its factorization.

51615545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856.

The product of its digits is 15000, while the sum is 32.

The square root of 51615545 is about 7184.3959384210. The cubic root of 51615545 is about 372.3289787428.

It can be divided in two parts, 516 and 15545, that added together give a palindrome (16061).

The spelling of 51615545 in words is "fifty-one million, six hundred fifteen thousand, five hundred forty-five".