51213135 has 8 divisors (see below), whose sum is σ = 81941040. Its totient is φ = 27313664.

The previous prime is 51213119. The next prime is 51213137. The reversal of 51213135 is 53131215.

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 51213135 - 2⁴ = 51213119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51213137) 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, 1707090 + ... + 1707119.

It is an arithmetic number, because the mean of its divisors is an integer number (10242630).

Almost surely, 2^51213135 is an apocalyptic number.

51213135 is a deficient number, since it is larger than the sum of its proper divisors (30727905).

51213135 is a wasteful number, since it uses less digits than its factorization.

51213135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3414217.

The product of its digits is 450, while the sum is 21.

The square root of 51213135 is about 7156.3353051684. The cubic root of 51213135 is about 371.3588577601.

It can be divided in two parts, 5121 and 3135, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 51213135 in words is "fifty-one million, two hundred thirteen thousand, one hundred thirty-five".