51108917 has 4 divisors (see below), whose sum is σ = 53798880. Its totient is φ = 48418956.

The previous prime is 51108913. The next prime is 51108931. The reversal of 51108917 is 71980115.

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: 71980115 = 5 ⋅14396023.

It is a cyclic number.

It is not a de Polignac number, because 51108917 - 2² = 51108913 is a prime.

It is a super-2 number, since 2×51108917² = 5224242793825778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51108913) 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, 1344953 + ... + 1344990.

It is an arithmetic number, because the mean of its divisors is an integer number (13449720).

Almost surely, 2^51108917 is an apocalyptic number.

It is an amenable number.

51108917 is a deficient number, since it is larger than the sum of its proper divisors (2689963).

51108917 is a wasteful number, since it uses less digits than its factorization.

51108917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689962.

The product of its (nonzero) digits is 2520, while the sum is 32.

The square root of 51108917 is about 7149.0500767585. The cubic root of 51108917 is about 371.1067833654.

It can be divided in two parts, 51108 and 917, that added together give a palindrome (52025).

The spelling of 51108917 in words is "fifty-one million, one hundred eight thousand, nine hundred seventeen".