51561001 has 8 divisors (see below), whose sum is σ = 51989184. Its totient is φ = 51135120.

The previous prime is 51560987. The next prime is 51561031. The reversal of 51561001 is 10016515.

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

It is a cyclic number.

It is not a de Polignac number, because 51561001 - 2⁹ = 51560489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51561001.

It is not an unprimeable number, because it can be changed into a prime (51561031) 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, 98326 + ... + 98848.

It is an arithmetic number, because the mean of its divisors is an integer number (6498648).

Almost surely, 2^51561001 is an apocalyptic number.

It is an amenable number.

51561001 is a deficient number, since it is larger than the sum of its proper divisors (428183).

51561001 is a wasteful number, since it uses less digits than its factorization.

51561001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 51561001 is about 7180.5989304514. The cubic root of 51561001 is about 372.1977813841.

Adding to 51561001 its reverse (10016515), we get a palindrome (61577516).

It can be divided in two parts, 515 and 61001, that added together give a palindrome (61516).

The spelling of 51561001 in words is "fifty-one million, five hundred sixty-one thousand, one".