51667831 has 4 divisors (see below), whose sum is σ = 52928064. Its totient is φ = 50407600.

The previous prime is 51667823. The next prime is 51667871. The reversal of 51667831 is 13876615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13876615 = 5 ⋅2775323.

It is a cyclic number.

It is not a de Polignac number, because 51667831 - 2³ = 51667823 is a prime.

It is a super-2 number, since 2×51667831² = 5339129520489122, 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 (51667801) 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, 630055 + ... + 630136.

It is an arithmetic number, because the mean of its divisors is an integer number (13232016).

Almost surely, 2^51667831 is an apocalyptic number.

51667831 is a deficient number, since it is larger than the sum of its proper divisors (1260233).

51667831 is a wasteful number, since it uses less digits than its factorization.

51667831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260232.

The product of its digits is 30240, while the sum is 37.

The square root of 51667831 is about 7188.0338758245. The cubic root of 51667831 is about 372.4546580848.

The spelling of 51667831 in words is "fifty-one million, six hundred sixty-seven thousand, eight hundred thirty-one".