51263109 has 18 divisors (see below), whose sum is σ = 78662610. Its totient is φ = 32163456.

The previous prime is 51263099. The next prime is 51263129. The reversal of 51263109 is 90136215.

It can be written as a sum of positive squares in 3 ways, for example, as 20958084 + 30305025 = 4578^2 + 5505^2 .

It is not a de Polignac number, because 51263109 - 2⁵ = 51263077 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51263129) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7254 + ... + 12455.

It is an arithmetic number, because the mean of its divisors is an integer number (4370145).

Almost surely, 2^51263109 is an apocalyptic number.

It is an amenable number.

51263109 is a deficient number, since it is larger than the sum of its proper divisors (27399501).

51263109 is a wasteful number, since it uses less digits than its factorization.

51263109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19749 (or 19729 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 51263109 is about 7159.8260453729. The cubic root of 51263109 is about 371.4796096884.

The spelling of 51263109 in words is "fifty-one million, two hundred sixty-three thousand, one hundred nine".