51148517 has 4 divisors (see below), whose sum is σ = 58455456. Its totient is φ = 43841580.

The previous prime is 51148507. The next prime is 51148519. The reversal of 51148517 is 71584115.

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.

It is a cyclic number.

It is not a de Polignac number, because 51148517 - 2⁸ = 51148261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51148519) 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, 3653459 + ... + 3653472.

It is an arithmetic number, because the mean of its divisors is an integer number (14613864).

Almost surely, 2^51148517 is an apocalyptic number.

It is an amenable number.

51148517 is a deficient number, since it is larger than the sum of its proper divisors (7306939).

51148517 is an equidigital number, since it uses as much as digits as its factorization.

51148517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7306938.

The product of its digits is 5600, while the sum is 32.

The square root of 51148517 is about 7151.8191392121. The cubic root of 51148517 is about 371.2026050967.

It can be divided in two parts, 5114 and 8517, that added together give a palindrome (13631).

The spelling of 51148517 in words is "fifty-one million, one hundred forty-eight thousand, five hundred seventeen".