51172001 has 4 divisors (see below), whose sum is σ = 51650352. Its totient is φ = 50693652.

The previous prime is 51171947. The next prime is 51172003. The reversal of 51172001 is 10027115.

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.

It is a cyclic number.

It is not a de Polignac number, because 51172001 - 2¹⁴ = 51155617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51172003) 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 3 ways as a sum of consecutive naturals, for example, 239015 + ... + 239228.

It is an arithmetic number, because the mean of its divisors is an integer number (12912588).

Almost surely, 2^51172001 is an apocalyptic number.

It is an amenable number.

51172001 is a deficient number, since it is larger than the sum of its proper divisors (478351).

51172001 is a wasteful number, since it uses less digits than its factorization.

51172001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478350.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 51172001 is about 7153.4607708437. The cubic root of 51172001 is about 371.2594069272.

Adding to 51172001 its reverse (10027115), we get a palindrome (61199116).

The spelling of 51172001 in words is "fifty-one million, one hundred seventy-two thousand, one".