51864031 has 4 divisors (see below), whose sum is σ = 51912832. Its totient is φ = 51815232.

The previous prime is 51864019. The next prime is 51864041. The reversal of 51864031 is 13046815.

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 51864031 - 2⁹ = 51863519 is a prime.

It is a super-2 number, since 2×51864031² = 5379755423137922, 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 (51864041) 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, 22770 + ... + 24943.

It is an arithmetic number, because the mean of its divisors is an integer number (12978208).

Almost surely, 2^51864031 is an apocalyptic number.

51864031 is a deficient number, since it is larger than the sum of its proper divisors (48801).

51864031 is a wasteful number, since it uses less digits than its factorization.

51864031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48800.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 51864031 is about 7201.6686260894. The cubic root of 51864031 is about 372.9255074809.

It can be divided in two parts, 518640 and 31, that added together give a triangular number (518671 = T₁₀₁₈).

The spelling of 51864031 in words is "fifty-one million, eight hundred sixty-four thousand, thirty-one".