51989617 has 4 divisors (see below), whose sum is σ = 52573860. Its totient is φ = 51405376.

The previous prime is 51989611. The next prime is 51989653. The reversal of 51989617 is 71698915.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27029601 + 24960016 = 5199^2 + 4996^2 .

It is a cyclic number.

It is not a de Polignac number, because 51989617 - 2¹¹ = 51987569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51989611) 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, 291988 + ... + 292165.

It is an arithmetic number, because the mean of its divisors is an integer number (13143465).

Almost surely, 2^51989617 is an apocalyptic number.

It is an amenable number.

51989617 is a deficient number, since it is larger than the sum of its proper divisors (584243).

51989617 is an equidigital number, since it uses as much as digits as its factorization.

51989617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584242.

The product of its digits is 136080, while the sum is 46.

The square root of 51989617 is about 7210.3825834695. The cubic root of 51989617 is about 373.2262712952.

The spelling of 51989617 in words is "fifty-one million, nine hundred eighty-nine thousand, six hundred seventeen".