51633725 has 54 divisors (see below), whose sum is σ = 76959918. Its totient is φ = 34320000.

The previous prime is 51633707. The next prime is 51633731. The reversal of 51633725 is 52733615.

It can be written as a sum of positive squares in 9 ways, for example, as 18028516 + 33605209 = 4246^2 + 5797^2 .

It is not a de Polignac number, because 51633725 - 2¹⁴ = 51617341 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51633691 and 51633700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 511175 + ... + 511275.

Almost surely, 2^51633725 is an apocalyptic number.

51633725 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51633725 is a deficient number, since it is larger than the sum of its proper divisors (25326193).

51633725 is a wasteful number, since it uses less digits than its factorization.

51633725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 130 counting only the distinct ones).

The product of its digits is 18900, while the sum is 32.

The square root of 51633725 is about 7185.6610691014. The cubic root of 51633725 is about 372.3726874503.

It can be divided in two parts, 5163 and 3725, that added together give a palindrome (8888).

The spelling of 51633725 in words is "fifty-one million, six hundred thirty-three thousand, seven hundred twenty-five".