51215401 has 4 divisors (see below), whose sum is σ = 51362500. Its totient is φ = 51068304.

The previous prime is 51215377. The next prime is 51215419. The reversal of 51215401 is 10451215.

51215401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20976400 + 30239001 = 4580^2 + 5499^2 .

It is a cyclic number.

It is not a de Polignac number, because 51215401 - 2⁵ = 51215369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51215201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73026 + ... + 73723.

It is an arithmetic number, because the mean of its divisors is an integer number (12840625).

Almost surely, 2^51215401 is an apocalyptic number.

It is an amenable number.

51215401 is a deficient number, since it is larger than the sum of its proper divisors (147099).

51215401 is a wasteful number, since it uses less digits than its factorization.

51215401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147098.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 51215401 is about 7156.4936246740. The cubic root of 51215401 is about 371.3643347845.

Adding to 51215401 its reverse (10451215), we get a palindrome (61666616).

The spelling of 51215401 in words is "fifty-one million, two hundred fifteen thousand, four hundred one".