51551361 has 24 divisors (see below), whose sum is σ = 79151904. Its totient is φ = 32219520.

The previous prime is 51551333. The next prime is 51551363. The reversal of 51551361 is 16315515.

51551361 is a `hidden beast` number, since 51 + 551 + 3 + 61 = 666.

It is not a de Polignac number, because 51551361 - 2²⁵ = 17996929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51551363) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52606 + ... + 53576.

It is an arithmetic number, because the mean of its divisors is an integer number (3297996).

Almost surely, 2^51551361 is an apocalyptic number.

51551361 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51551361 is a deficient number, since it is larger than the sum of its proper divisors (27600543).

51551361 is a wasteful number, since it uses less digits than its factorization.

51551361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341 (or 1338 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 51551361 is about 7179.9276458750. The cubic root of 51551361 is about 372.1745841990.

Adding to 51551361 its reverse (16315515), we get a palindrome (67866876).

The spelling of 51551361 in words is "fifty-one million, five hundred fifty-one thousand, three hundred sixty-one".