51769391 has 4 divisors (see below), whose sum is σ = 52177152. Its totient is φ = 51361632.

The previous prime is 51769381. The next prime is 51769409. The reversal of 51769391 is 19396715.

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

It is a cyclic number.

It is not a de Polignac number, because 51769391 - 2¹⁴ = 51753007 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 (51769331) 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, 203690 + ... + 203943.

It is an arithmetic number, because the mean of its divisors is an integer number (13044288).

Almost surely, 2^51769391 is an apocalyptic number.

51769391 is a deficient number, since it is larger than the sum of its proper divisors (407761).

51769391 is a wasteful number, since it uses less digits than its factorization.

51769391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407760.

The product of its digits is 51030, while the sum is 41.

The square root of 51769391 is about 7195.0949264065. The cubic root of 51769391 is about 372.6985347681.

The spelling of 51769391 in words is "fifty-one million, seven hundred sixty-nine thousand, three hundred ninety-one".