51551144 has 8 divisors (see below), whose sum is σ = 96658410. Its totient is φ = 25775568.

The previous prime is 51551141. The next prime is 51551147. The reversal of 51551144 is 44115515.

51551144 is nontrivially palindromic in base 7.

It is an interprime number because it is at equal distance from previous prime (51551141) and next prime (51551147).

It can be written as a sum of positive squares in only one way, i.e., 38316100 + 13235044 = 6190^2 + 3638^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (51551141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3221939 + ... + 3221954.

Almost surely, 2^51551144 is an apocalyptic number.

It is an amenable number.

51551144 is a deficient number, since it is larger than the sum of its proper divisors (45107266).

51551144 is a wasteful number, since it uses less digits than its factorization.

51551144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6443899 (or 6443895 counting only the distinct ones).

The product of its digits is 2000, while the sum is 26.

The square root of 51551144 is about 7179.9125342862. The cubic root of 51551144 is about 372.1740619885.

Adding to 51551144 its reverse (44115515), we get a palindrome (95666659).

The spelling of 51551144 in words is "fifty-one million, five hundred fifty-one thousand, one hundred forty-four".