51338491 has 4 divisors (see below), whose sum is σ = 52041832. Its totient is φ = 50635152.

The previous prime is 51338489. The next prime is 51338501. The reversal of 51338491 is 19483315.

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

It is a cyclic number.

It is not a de Polignac number, because 51338491 - 2¹ = 51338489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51338411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351561 + ... + 351706.

It is an arithmetic number, because the mean of its divisors is an integer number (13010458).

Almost surely, 2^51338491 is an apocalyptic number.

51338491 is a deficient number, since it is larger than the sum of its proper divisors (703341).

51338491 is an equidigital number, since it uses as much as digits as its factorization.

51338491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703340.

The product of its digits is 12960, while the sum is 34.

The square root of 51338491 is about 7165.0883455823. The cubic root of 51338491 is about 371.6616064607.

The spelling of 51338491 in words is "fifty-one million, three hundred thirty-eight thousand, four hundred ninety-one".