51989505 has 32 divisors (see below), whose sum is σ = 85532160. Its totient is φ = 26956800.

The previous prime is 51989503. The next prime is 51989513. The reversal of 51989505 is 50598915.

It is a happy number.

It is not a de Polignac number, because 51989505 - 2¹ = 51989503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51989503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86205 + ... + 86805.

It is an arithmetic number, because the mean of its divisors is an integer number (2672880).

Almost surely, 2^51989505 is an apocalyptic number.

It is an amenable number.

51989505 is a deficient number, since it is larger than the sum of its proper divisors (33542655).

51989505 is a wasteful number, since it uses less digits than its factorization.

51989505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761.

The product of its (nonzero) digits is 81000, while the sum is 42.

The square root of 51989505 is about 7210.3748168871. The cubic root of 51989505 is about 373.2260032841.

The spelling of 51989505 in words is "fifty-one million, nine hundred eighty-nine thousand, five hundred five".