51869349 has 16 divisors (see below), whose sum is σ = 87821440. Its totient is φ = 29639520.

The previous prime is 51869327. The next prime is 51869353. The reversal of 51869349 is 94396815.

It is a happy number.

51869349 is a `hidden beast` number, since 518 + 6 + 93 + 49 = 666.

It is not a de Polignac number, because 51869349 - 2¹¹ = 51867301 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 (51869359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137032 + ... + 137409.

It is an arithmetic number, because the mean of its divisors is an integer number (5488840).

Almost surely, 2^51869349 is an apocalyptic number.

It is an amenable number.

51869349 is a deficient number, since it is larger than the sum of its proper divisors (35952091).

51869349 is a wasteful number, since it uses less digits than its factorization.

51869349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274457 (or 274451 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 51869349 is about 7202.0378366126. The cubic root of 51869349 is about 372.9382533090.

It can be divided in two parts, 5186 and 9349, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 51869349 in words is "fifty-one million, eight hundred sixty-nine thousand, three hundred forty-nine".