51133209 has 8 divisors (see below), whose sum is σ = 71141952. Its totient is φ = 32606640.

The previous prime is 51133193. The next prime is 51133213. The reversal of 51133209 is 90233115.

It is a happy number.

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

It is not a de Polignac number, because 51133209 - 2⁴ = 51133193 is a prime.

It is a super-2 number, since 2×51133209² = 5229210125275362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51133279) 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, 370462 + ... + 370599.

It is an arithmetic number, because the mean of its divisors is an integer number (8892744).

Almost surely, 2^51133209 is an apocalyptic number.

It is an amenable number.

51133209 is a deficient number, since it is larger than the sum of its proper divisors (20008743).

51133209 is a wasteful number, since it uses less digits than its factorization.

51133209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741087.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 51133209 is about 7150.7488419046. The cubic root of 51133209 is about 371.1655695722.

The spelling of 51133209 in words is "fifty-one million, one hundred thirty-three thousand, two hundred nine".