51985231 has 8 divisors (see below), whose sum is σ = 52417904. Its totient is φ = 51554880.

The previous prime is 51985229. The next prime is 51985249. The reversal of 51985231 is 13258915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51985231 - 2¹ = 51985229 is a prime.

It is a super-2 number, since 2×51985231² = 5404928484246722, 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 (51985211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95821 + ... + 96361.

It is an arithmetic number, because the mean of its divisors is an integer number (6552238).

Almost surely, 2^51985231 is an apocalyptic number.

51985231 is a deficient number, since it is larger than the sum of its proper divisors (432673).

51985231 is a wasteful number, since it uses less digits than its factorization.

With its successor (51985232) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1161).

51985231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161.

The product of its digits is 10800, while the sum is 34.

The square root of 51985231 is about 7210.0784323057. The cubic root of 51985231 is about 373.2157755042.

The spelling of 51985231 in words is "fifty-one million, nine hundred eighty-five thousand, two hundred thirty-one".