51909453 has 18 divisors (see below), whose sum is σ = 75884874. Its totient is φ = 34193664.

The previous prime is 51909433. The next prime is 51909461. The reversal of 51909453 is 35490915.

51909453 is a `hidden beast` number, since 519 + 0 + 94 + 53 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 26244 + 51883209 = 162^2 + 7203^2 .

It is not a de Polignac number, because 51909453 - 2²² = 47715149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51909433) 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 17 ways as a sum of consecutive naturals, for example, 84375 + ... + 84987.

Almost surely, 2^51909453 is an apocalyptic number.

It is an amenable number.

51909453 is a deficient number, since it is larger than the sum of its proper divisors (23975421).

51909453 is an equidigital number, since it uses as much as digits as its factorization.

51909453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 51909453 is about 7204.8215106274. The cubic root of 51909453 is about 373.0343438586.

The spelling of 51909453 in words is "fifty-one million, nine hundred nine thousand, four hundred fifty-three".