51581001 has 8 divisors (see below), whose sum is σ = 69024064. Its totient is φ = 34262640.

The previous prime is 51580981. The next prime is 51581017. The reversal of 51581001 is 10018515.

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

It is not a de Polignac number, because 51581001 - 2¹⁰ = 51579977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51581021) 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, 30205 + ... + 31866.

It is an arithmetic number, because the mean of its divisors is an integer number (8628008).

Almost surely, 2^51581001 is an apocalyptic number.

It is an amenable number.

51581001 is a deficient number, since it is larger than the sum of its proper divisors (17443063).

51581001 is a wasteful number, since it uses less digits than its factorization.

51581001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62351.

The product of its (nonzero) digits is 200, while the sum is 21.

The square root of 51581001 is about 7181.9914369205. The cubic root of 51581001 is about 372.2458991036.

Adding to 51581001 its reverse (10018515), we get a palindrome (61599516).

The spelling of 51581001 in words is "fifty-one million, five hundred eighty-one thousand, one".