51361378 has 16 divisors (see below), whose sum is σ = 79875000. Its totient is φ = 24740352.

The previous prime is 51361367. The next prime is 51361379. The reversal of 51361378 is 87316315.

It can be written as a sum of positive squares in 4 ways, for example, as 33443089 + 17918289 = 5783^2 + 4233^2 .

It is not an unprimeable number, because it can be changed into a prime (51361379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40498 + ... + 41746.

Almost surely, 2^51361378 is an apocalyptic number.

51361378 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

51361378 is a deficient number, since it is larger than the sum of its proper divisors (28513622).

51361378 is a wasteful number, since it uses less digits than its factorization.

51361378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989.

The product of its digits is 15120, while the sum is 34.

The square root of 51361378 is about 7166.6852867975. The cubic root of 51361378 is about 371.7168278959.

The spelling of 51361378 in words is "fifty-one million, three hundred sixty-one thousand, three hundred seventy-eight".