51603231 has 12 divisors (see below), whose sum is σ = 69452376. Its totient is φ = 34079760.

The previous prime is 51603173. The next prime is 51603239. The reversal of 51603231 is 13230615.

It is not a de Polignac number, because 51603231 - 2²³ = 43214623 is a prime.

It is a super-2 number, since 2×51603231² = 5325786899278722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51603198 and 51603207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51603239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155736 + ... + 156066.

It is an arithmetic number, because the mean of its divisors is an integer number (5787698).

Almost surely, 2^51603231 is an apocalyptic number.

51603231 is a deficient number, since it is larger than the sum of its proper divisors (17849145).

51603231 is an equidigital number, since it uses as much as digits as its factorization.

51603231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 51603231 is about 7183.5388911037. The cubic root of 51603231 is about 372.2993673554.

Adding to 51603231 its reverse (13230615), we get a palindrome (64833846).

The spelling of 51603231 in words is "fifty-one million, six hundred three thousand, two hundred thirty-one".