51670213 has 16 divisors (see below), whose sum is σ = 61839360. Its totient is φ = 42212016.

The previous prime is 51670183. The next prime is 51670217. The reversal of 51670213 is 31207615.

It is not a de Polignac number, because 51670213 - 2⁹ = 51669701 is a prime.

It is a super-2 number, since 2×51670213² = 5339621822930738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51670217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78078 + ... + 78736.

It is an arithmetic number, because the mean of its divisors is an integer number (3864960).

Almost surely, 2^51670213 is an apocalyptic number.

It is an amenable number.

51670213 is a deficient number, since it is larger than the sum of its proper divisors (10169147).

51670213 is a wasteful number, since it uses less digits than its factorization.

51670213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 51670213 is about 7188.1995659553. The cubic root of 51670213 is about 372.4603816549.

Adding to 51670213 its reverse (31207615), we get a palindrome (82877828).

The spelling of 51670213 in words is "fifty-one million, six hundred seventy thousand, two hundred thirteen".