51355415 has 4 divisors (see below), whose sum is σ = 61626504. Its totient is φ = 41084328.

The previous prime is 51355379. The next prime is 51355439. The reversal of 51355415 is 51455315.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51355415 - 2¹⁶ = 51289879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5135537 + ... + 5135546.

It is an arithmetic number, because the mean of its divisors is an integer number (15406626).

Almost surely, 2^51355415 is an apocalyptic number.

51355415 is a deficient number, since it is larger than the sum of its proper divisors (10271089).

51355415 is a wasteful number, since it uses less digits than its factorization.

51355415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10271088.

The product of its digits is 7500, while the sum is 29.

The square root of 51355415 is about 7166.2692525470. The cubic root of 51355415 is about 371.7024420330.

The spelling of 51355415 in words is "fifty-one million, three hundred fifty-five thousand, four hundred fifteen".