51655493 has 8 divisors (see below), whose sum is σ = 54585600. Its totient is φ = 48782448.

The previous prime is 51655489. The next prime is 51655501. The reversal of 51655493 is 39455615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51655493 - 2² = 51655489 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 (51655403) 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 7 ways as a sum of consecutive naturals, for example, 12398 + ... + 16031.

It is an arithmetic number, because the mean of its divisors is an integer number (6823200).

Almost surely, 2^51655493 is an apocalyptic number.

It is an amenable number.

51655493 is a deficient number, since it is larger than the sum of its proper divisors (2930107).

51655493 is a wasteful number, since it uses less digits than its factorization.

51655493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28531.

The product of its digits is 81000, while the sum is 38.

The square root of 51655493 is about 7187.1755926789. The cubic root of 51655493 is about 372.4250090020.

The spelling of 51655493 in words is "fifty-one million, six hundred fifty-five thousand, four hundred ninety-three".