51405001 has 4 divisors (see below), whose sum is σ = 51572752. Its totient is φ = 51237252.

The previous prime is 51404999. The next prime is 51405007. The reversal of 51405001 is 10050415.

It is a happy number.

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: 10050415 = 5 ⋅2010083.

It is a cyclic number.

It is not a de Polignac number, because 51405001 - 2¹ = 51404999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51405007) 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, 83415 + ... + 84028.

It is an arithmetic number, because the mean of its divisors is an integer number (12893188).

Almost surely, 2^51405001 is an apocalyptic number.

It is an amenable number.

51405001 is a deficient number, since it is larger than the sum of its proper divisors (167751).

51405001 is a wasteful number, since it uses less digits than its factorization.

51405001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167750.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 51405001 is about 7169.7280980523. The cubic root of 51405001 is about 371.8220354482.

Adding to 51405001 its reverse (10050415), we get a palindrome (61455416).

The spelling of 51405001 in words is "fifty-one million, four hundred five thousand, one".