51961617 has 6 divisors (see below), whose sum is σ = 75055682. Its totient is φ = 34641072.

The previous prime is 51961603. The next prime is 51961627. The reversal of 51961617 is 71616915.

It is a happy number.

51961617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 36469521 + 15492096 = 6039^2 + 3936^2 .

It is not a de Polignac number, because 51961617 - 2⁷ = 51961489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51961627) 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 5 ways as a sum of consecutive naturals, for example, 2886748 + ... + 2886765.

Almost surely, 2^51961617 is an apocalyptic number.

It is an amenable number.

51961617 is a deficient number, since it is larger than the sum of its proper divisors (23094065).

51961617 is a wasteful number, since it uses less digits than its factorization.

51961617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5773519 (or 5773516 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 51961617 is about 7208.4406774281. The cubic root of 51961617 is about 373.1592565536.

The spelling of 51961617 in words is "fifty-one million, nine hundred sixty-one thousand, six hundred seventeen".