51112505 has 4 divisors (see below), whose sum is σ = 61335012. Its totient is φ = 40890000.

The previous prime is 51112493. The next prime is 51112507. The reversal of 51112505 is 50521115.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 35557369 + 15555136 = 5963^2 + 3944^2 .

It is not a de Polignac number, because 51112505 - 2⁶ = 51112441 is a prime.

It is a super-2 number, since 2×51112505² = 5224976334750050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51112507) 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, 5111246 + ... + 5111255.

It is an arithmetic number, because the mean of its divisors is an integer number (15333753).

Almost surely, 2^51112505 is an apocalyptic number.

It is an amenable number.

51112505 is a deficient number, since it is larger than the sum of its proper divisors (10222507).

51112505 is a wasteful number, since it uses less digits than its factorization.

51112505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10222506.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 51112505 is about 7149.3010147846. The cubic root of 51112505 is about 371.1154674337.

The spelling of 51112505 in words is "fifty-one million, one hundred twelve thousand, five hundred five".