51215402 has 16 divisors (see below), whose sum is σ = 87908352. Its totient is φ = 21921840.

The previous prime is 51215377. The next prime is 51215419. The reversal of 51215402 is 20451215.

51215402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12503 + ... + 16085.

It is an arithmetic number, because the mean of its divisors is an integer number (5494272).

Almost surely, 2^51215402 is an apocalyptic number.

51215402 is a deficient number, since it is larger than the sum of its proper divisors (36692950).

51215402 is a wasteful number, since it uses less digits than its factorization.

51215402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4613.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 51215402 is about 7156.4936945406. The cubic root of 51215402 is about 371.3643372015.

Adding to 51215402 its reverse (20451215), we get a palindrome (71666617).

The spelling of 51215402 in words is "fifty-one million, two hundred fifteen thousand, four hundred two".