51661433 has 4 divisors (see below), whose sum is σ = 51960228. Its totient is φ = 51362640.

The previous prime is 51661411. The next prime is 51661457. The reversal of 51661433 is 33416615.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46607929 + 5053504 = 6827^2 + 2248^2 .

It is a cyclic number.

It is not a de Polignac number, because 51661433 - 2¹⁰ = 51660409 is a prime.

It is a super-2 number, since 2×51661433² = 5337807319226978, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51661396 and 51661405.

It is not an unprimeable number, because it can be changed into a prime (51661333) 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, 149138 + ... + 149483.

It is an arithmetic number, because the mean of its divisors is an integer number (12990057).

Almost surely, 2^51661433 is an apocalyptic number.

It is an amenable number.

51661433 is a deficient number, since it is larger than the sum of its proper divisors (298795).

51661433 is a wasteful number, since it uses less digits than its factorization.

51661433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298794.

The product of its digits is 6480, while the sum is 29.

The square root of 51661433 is about 7187.5888168425. The cubic root of 51661433 is about 372.4392838295.

The spelling of 51661433 in words is "fifty-one million, six hundred sixty-one thousand, four hundred thirty-three".