51723725 has 6 divisors (see below), whose sum is σ = 64137450. Its totient is φ = 41378960.

The previous prime is 51723697. The next prime is 51723731. The reversal of 51723725 is 52732715.

It can be written as a sum of positive squares in 3 ways, for example, as 70756 + 51652969 = 266^2 + 7187^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51723725 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51723691 and 51723700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1034450 + ... + 1034499.

It is an arithmetic number, because the mean of its divisors is an integer number (10689575).

Almost surely, 2^51723725 is an apocalyptic number.

It is an amenable number.

51723725 is a deficient number, since it is larger than the sum of its proper divisors (12413725).

51723725 is a wasteful number, since it uses less digits than its factorization.

51723725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2068959 (or 2068954 counting only the distinct ones).

The product of its digits is 14700, while the sum is 32.

The square root of 51723725 is about 7191.9208143583. The cubic root of 51723725 is about 372.5889162092.

It can be divided in two parts, 517 and 23725, that added together give a palindrome (24242).

The spelling of 51723725 in words is "fifty-one million, seven hundred twenty-three thousand, seven hundred twenty-five".