51213235 has 4 divisors (see below), whose sum is σ = 61455888. Its totient is φ = 40970584.

The previous prime is 51213233. The next prime is 51213257. The reversal of 51213235 is 53231215.

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

It is a cyclic number.

It is not a de Polignac number, because 51213235 - 2¹ = 51213233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51213233) 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, 5121319 + ... + 5121328.

It is an arithmetic number, because the mean of its divisors is an integer number (15363972).

Almost surely, 2^51213235 is an apocalyptic number.

51213235 is a deficient number, since it is larger than the sum of its proper divisors (10242653).

51213235 is a wasteful number, since it uses less digits than its factorization.

51213235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10242652.

The product of its digits is 900, while the sum is 22.

The square root of 51213235 is about 7156.3422919813. The cubic root of 51213235 is about 371.3590994680.

The spelling of 51213235 in words is "fifty-one million, two hundred thirteen thousand, two hundred thirty-five".