51561415 has 4 divisors (see below), whose sum is σ = 61873704. Its totient is φ = 41249128.

The previous prime is 51561379. The next prime is 51561427. The reversal of 51561415 is 51416515.

It is a happy number.

51561415 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51416515 = 5 ⋅10283303.

It is a cyclic number.

It is not a de Polignac number, because 51561415 - 2¹¹ = 51559367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5156137 + ... + 5156146.

It is an arithmetic number, because the mean of its divisors is an integer number (15468426).

Almost surely, 2^51561415 is an apocalyptic number.

51561415 is a deficient number, since it is larger than the sum of its proper divisors (10312289).

51561415 is a wasteful number, since it uses less digits than its factorization.

51561415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10312288.

The product of its digits is 3000, while the sum is 28.

The square root of 51561415 is about 7180.6277580724. The cubic root of 51561415 is about 372.1987775470.

The spelling of 51561415 in words is "fifty-one million, five hundred sixty-one thousand, four hundred fifteen".