51612005 has 8 divisors (see below), whose sum is σ = 62135424. Its totient is φ = 41155600.

The previous prime is 51611981. The next prime is 51612007. The reversal of 51612005 is 50021615.

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

It is not a de Polignac number, because 51612005 - 2¹² = 51607909 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 (51612007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15041 + ... + 18150.

It is an arithmetic number, because the mean of its divisors is an integer number (7766928).

Almost surely, 2^51612005 is an apocalyptic number.

It is an amenable number.

51612005 is a deficient number, since it is larger than the sum of its proper divisors (10523419).

51612005 is a wasteful number, since it uses less digits than its factorization.

51612005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33507.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 51612005 is about 7184.1495669286. The cubic root of 51612005 is about 372.3204666126.

It can be divided in two parts, 516 and 12005, that added together give a palindrome (12521).

The spelling of 51612005 in words is "fifty-one million, six hundred twelve thousand, five".