51724031 has 4 divisors (see below), whose sum is σ = 51870912. Its totient is φ = 51577152.

The previous prime is 51724021. The next prime is 51724037. The reversal of 51724031 is 13042715.

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 51724031 - 2⁶ = 51723967 is a prime.

It is a super-2 number, since 2×51724031² = 5350750765777922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51723988 and 51724006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51724037) 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, 72911 + ... + 73616.

It is an arithmetic number, because the mean of its divisors is an integer number (12967728).

Almost surely, 2^51724031 is an apocalyptic number.

51724031 is a deficient number, since it is larger than the sum of its proper divisors (146881).

51724031 is a wasteful number, since it uses less digits than its factorization.

51724031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146880.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 51724031 is about 7191.9420881984. The cubic root of 51724031 is about 372.5896509589.

Adding to 51724031 its reverse (13042715), we get a palindrome (64766746).

The spelling of 51724031 in words is "fifty-one million, seven hundred twenty-four thousand, thirty-one".