51888989 has 4 divisors (see below), whose sum is σ = 54145056. Its totient is φ = 49632924.

The previous prime is 51888937. The next prime is 51889007. The reversal of 51888989 is 98988815.

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 a de Polignac number, because none of the positive numbers 2^k-51888989 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 (51888919) 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, 1127999 + ... + 1128044.

It is an arithmetic number, because the mean of its divisors is an integer number (13536264).

Almost surely, 2^51888989 is an apocalyptic number.

It is an amenable number.

51888989 is a deficient number, since it is larger than the sum of its proper divisors (2256067).

51888989 is a wasteful number, since it uses less digits than its factorization.

51888989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256066.

The product of its digits is 1658880, while the sum is 56.

The square root of 51888989 is about 7203.4012105394. The cubic root of 51888989 is about 372.9853176040.

The spelling of 51888989 in words is "fifty-one million, eight hundred eighty-eight thousand, nine hundred eighty-nine".