51887869 has 4 divisors (see below), whose sum is σ = 56604960. Its totient is φ = 47170780.

The previous prime is 51887867. The next prime is 51887897. The reversal of 51887869 is 96878815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51887869 - 2¹ = 51887867 is a prime.

It is a super-2 number, since 2×51887869² = 5384701898722322, 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 (51887861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2358529 + ... + 2358550.

It is an arithmetic number, because the mean of its divisors is an integer number (14151240).

Almost surely, 2^51887869 is an apocalyptic number.

It is an amenable number.

51887869 is a deficient number, since it is larger than the sum of its proper divisors (4717091).

51887869 is a wasteful number, since it uses less digits than its factorization.

51887869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4717090.

The product of its digits is 967680, while the sum is 52.

The square root of 51887869 is about 7203.3234690662. The cubic root of 51887869 is about 372.9826340124.

The spelling of 51887869 in words is "fifty-one million, eight hundred eighty-seven thousand, eight hundred sixty-nine".