51382681 has 4 divisors (see below), whose sum is σ = 58723072. Its totient is φ = 44042292.

The previous prime is 51382673. The next prime is 51382699. The reversal of 51382681 is 18628315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18628315 = 5 ⋅3725663.

It is not a de Polignac number, because 51382681 - 2³ = 51382673 is a prime.

It is a super-2 number, since 2×51382681² = 5280359813495522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51382651) 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, 3670185 + ... + 3670198.

It is an arithmetic number, because the mean of its divisors is an integer number (14680768).

Almost surely, 2^51382681 is an apocalyptic number.

It is an amenable number.

51382681 is a deficient number, since it is larger than the sum of its proper divisors (7340391).

51382681 is an equidigital number, since it uses as much as digits as its factorization.

51382681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7340390.

The product of its digits is 11520, while the sum is 34.

The square root of 51382681 is about 7168.1713846699. The cubic root of 51382681 is about 371.7682127389.

The spelling of 51382681 in words is "fifty-one million, three hundred eighty-two thousand, six hundred eighty-one".