51505117 has 4 divisors (see below), whose sum is σ = 51549696. Its totient is φ = 51460540.

The previous prime is 51505109. The next prime is 51505123. The reversal of 51505117 is 71150515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71150515 = 5 ⋅14230103.

It is a cyclic number.

It is not a de Polignac number, because 51505117 - 2³ = 51505109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51505091 and 51505100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51505127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20509 + ... + 22882.

It is an arithmetic number, because the mean of its divisors is an integer number (12887424).

Almost surely, 2^51505117 is an apocalyptic number.

It is an amenable number.

51505117 is a deficient number, since it is larger than the sum of its proper divisors (44579).

51505117 is a wasteful number, since it uses less digits than its factorization.

51505117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44578.

The product of its (nonzero) digits is 875, while the sum is 25.

The square root of 51505117 is about 7176.7065566317. The cubic root of 51505117 is about 372.0632648597.

The spelling of 51505117 in words is "fifty-one million, five hundred five thousand, one hundred seventeen".