51209851 has 12 divisors (see below), whose sum is σ = 64986840. Its totient is φ = 39903360.

The previous prime is 51209843. The next prime is 51209863. The reversal of 51209851 is 15890215.

It is not a de Polignac number, because 51209851 - 2³ = 51209843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51209801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46966 + ... + 48043.

It is an arithmetic number, because the mean of its divisors is an integer number (5415570).

Almost surely, 2^51209851 is an apocalyptic number.

51209851 is a deficient number, since it is larger than the sum of its proper divisors (13776989).

51209851 is a wasteful number, since it uses less digits than its factorization.

51209851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95034 (or 95027 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 51209851 is about 7156.1058544435. The cubic root of 51209851 is about 371.3509198971.

It can be divided in two parts, 51 and 209851, that added together give a palindrome (209902).

The spelling of 51209851 in words is "fifty-one million, two hundred nine thousand, eight hundred fifty-one".