51540111 has 48 divisors (see below), whose sum is σ = 89740800. Its totient is φ = 29148336.

The previous prime is 51540061. The next prime is 51540121. The reversal of 51540111 is 11104515.

It is a happy number.

51540111 is a `hidden beast` number, since 515 + 40 + 111 = 666.

It is not a de Polignac number, because 51540111 - 2¹¹ = 51538063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51540121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 215530 + ... + 215768.

It is an arithmetic number, because the mean of its divisors is an integer number (1869600).

Almost surely, 2^51540111 is an apocalyptic number.

51540111 is a deficient number, since it is larger than the sum of its proper divisors (38200689).

51540111 is a wasteful number, since it uses less digits than its factorization.

51540111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 51540111 is about 7179.1441690497. The cubic root of 51540111 is about 372.1475091384.

Adding to 51540111 its reverse (11104515), we get a palindrome (62644626).

The spelling of 51540111 in words is "fifty-one million, five hundred forty thousand, one hundred eleven".