51508402 has 16 divisors (see below), whose sum is σ = 89245152. Its totient is φ = 22035520.

The previous prime is 51508397. The next prime is 51508433. The reversal of 51508402 is 20480515.

51508402 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, 68488 + ... + 69235.

It is an arithmetic number, because the mean of its divisors is an integer number (5577822).

Almost surely, 2^51508402 is an apocalyptic number.

51508402 is a deficient number, since it is larger than the sum of its proper divisors (37736750).

51508402 is a wasteful number, since it uses less digits than its factorization.

51508402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137753.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 51508402 is about 7176.9354184081. The cubic root of 51508402 is about 372.0711747653.

Adding to 51508402 its reverse (20480515), we get a palindrome (71988917).

The spelling of 51508402 in words is "fifty-one million, five hundred eight thousand, four hundred two".