51105557 has 4 divisors (see below), whose sum is σ = 52352076. Its totient is φ = 49859040.

The previous prime is 51105539. The next prime is 51105559. The reversal of 51105557 is 75550115.

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 19307236 + 31798321 = 4394^2 + 5639^2 .

It is a cyclic number.

It is not a de Polignac number, because 51105557 - 2¹² = 51101461 is a prime.

It is a super-2 number, since 2×51105557² = 5223555912560498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51105559) 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, 623198 + ... + 623279.

It is an arithmetic number, because the mean of its divisors is an integer number (13088019).

Almost surely, 2^51105557 is an apocalyptic number.

It is an amenable number.

51105557 is a deficient number, since it is larger than the sum of its proper divisors (1246519).

51105557 is a wasteful number, since it uses less digits than its factorization.

51105557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246518.

The product of its (nonzero) digits is 4375, while the sum is 29.

The square root of 51105557 is about 7148.8150766403. The cubic root of 51105557 is about 371.0986507590.

The spelling of 51105557 in words is "fifty-one million, one hundred five thousand, five hundred fifty-seven".