51315406 has 4 divisors (see below), whose sum is σ = 76973112. Its totient is φ = 25657702.

The previous prime is 51315403. The next prime is 51315431. The reversal of 51315406 is 60451315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60451315 = 5 ⋅12090263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51315403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12828850 + ... + 12828853.

It is an arithmetic number, because the mean of its divisors is an integer number (19243278).

Almost surely, 2^51315406 is an apocalyptic number.

51315406 is a deficient number, since it is larger than the sum of its proper divisors (25657706).

51315406 is a wasteful number, since it uses less digits than its factorization.

51315406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25657705.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 51315406 is about 7163.4772282740. The cubic root of 51315406 is about 371.6058906658.

The spelling of 51315406 in words is "fifty-one million, three hundred fifteen thousand, four hundred six".