51989069 has 4 divisors (see below), whose sum is σ = 56715360. Its totient is φ = 47262780.

The previous prime is 51989059. The next prime is 51989071. The reversal of 51989069 is 96098915.

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 51989069 - 2²⁰ = 50940493 is a prime.

It is a super-2 number, since 2×51989069² = 5405726590973522, 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 (51989029) 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, 2363129 + ... + 2363150.

It is an arithmetic number, because the mean of its divisors is an integer number (14178840).

Almost surely, 2^51989069 is an apocalyptic number.

It is an amenable number.

51989069 is a deficient number, since it is larger than the sum of its proper divisors (4726291).

51989069 is a wasteful number, since it uses less digits than its factorization.

51989069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4726290.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 51989069 is about 7210.3445826118. The cubic root of 51989069 is about 373.2249599518.

It can be divided in two parts, 5198906 and 9, that added together give a palindrome (5198915).

The spelling of 51989069 in words is "fifty-one million, nine hundred eighty-nine thousand, sixty-nine".