51516441 has 12 divisors (see below), whose sum is σ = 76978980. Its totient is φ = 33159840.

The previous prime is 51516433. The next prime is 51516449. The reversal of 51516441 is 14461515.

51516441 is a `hidden beast` number, since 5 + 15 + 1 + 644 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (51516433) and next prime (51516449).

It can be written as a sum of positive squares in 2 ways, for example, as 35283600 + 16232841 = 5940^2 + 4029^2 .

It is not a de Polignac number, because 51516441 - 2³ = 51516433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51516449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98430 + ... + 98951.

It is an arithmetic number, because the mean of its divisors is an integer number (6414915).

Almost surely, 2^51516441 is an apocalyptic number.

It is an amenable number.

51516441 is a deficient number, since it is larger than the sum of its proper divisors (25462539).

51516441 is a wasteful number, since it uses less digits than its factorization.

51516441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197416 (or 197413 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 51516441 is about 7177.4954545440. The cubic root of 51516441 is about 372.0905303426.

Adding to 51516441 its reverse (14461515), we get a palindrome (65977956).

The spelling of 51516441 in words is "fifty-one million, five hundred sixteen thousand, four hundred forty-one".