51515233 has 8 divisors (see below), whose sum is σ = 64226880. Its totient is φ = 40141680.

The previous prime is 51515227. The next prime is 51515249. The reversal of 51515233 is 33251515.

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 51515233 - 2⁹ = 51514721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51515198 and 51515207.

It is not an unprimeable number, because it can be changed into a prime (51515033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334438 + ... + 334591.

It is an arithmetic number, because the mean of its divisors is an integer number (8028360).

Almost surely, 2^51515233 is an apocalyptic number.

It is an amenable number.

51515233 is a deficient number, since it is larger than the sum of its proper divisors (12711647).

51515233 is a wasteful number, since it uses less digits than its factorization.

51515233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669047.

The product of its digits is 2250, while the sum is 25.

The square root of 51515233 is about 7177.4113021339. The cubic root of 51515233 is about 372.0876219580.

Adding to 51515233 its reverse (33251515), we get a palindrome (84766748).

The spelling of 51515233 in words is "fifty-one million, five hundred fifteen thousand, two hundred thirty-three".