51601951 has 4 divisors (see below), whose sum is σ = 51659752. Its totient is φ = 51544152.

The previous prime is 51601889. The next prime is 51601981. The reversal of 51601951 is 15910615.

51601951 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51601951 - 2⁹ = 51601439 is a prime.

It is a super-2 number, since 2×51601951² = 5325522694012802, 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 (51601981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27540 + ... + 29353.

It is an arithmetic number, because the mean of its divisors is an integer number (12914938).

Almost surely, 2^51601951 is an apocalyptic number.

51601951 is a deficient number, since it is larger than the sum of its proper divisors (57801).

51601951 is an equidigital number, since it uses as much as digits as its factorization.

51601951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57800.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 51601951 is about 7183.4497979731. The cubic root of 51601951 is about 372.2962890783.

The spelling of 51601951 in words is "fifty-one million, six hundred one thousand, nine hundred fifty-one".