51405653 has 4 divisors (see below), whose sum is σ = 55359948. Its totient is φ = 47451360.

The previous prime is 51405647. The next prime is 51405701. The reversal of 51405653 is 35650415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35650415 = 5 ⋅7130083.

It can be written as a sum of positive squares in 2 ways, for example, as 11992369 + 39413284 = 3463^2 + 6278^2 .

It is a cyclic number.

It is not a de Polignac number, because 51405653 - 2⁶ = 51405589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51405623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1977128 + ... + 1977153.

It is an arithmetic number, because the mean of its divisors is an integer number (13839987).

Almost surely, 2^51405653 is an apocalyptic number.

It is an amenable number.

51405653 is a deficient number, since it is larger than the sum of its proper divisors (3954295).

51405653 is a wasteful number, since it uses less digits than its factorization.

51405653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3954294.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 51405653 is about 7169.7735668569. The cubic root of 51405653 is about 371.8236074544.

The spelling of 51405653 in words is "fifty-one million, four hundred five thousand, six hundred fifty-three".