51210157 has 4 divisors (see below), whose sum is σ = 51911740. Its totient is φ = 50508576.

The previous prime is 51210151. The next prime is 51210169. The reversal of 51210157 is 75101215.

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 13498276 + 37711881 = 3674^2 + 6141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51210157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51210151) 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, 350682 + ... + 350827.

It is an arithmetic number, because the mean of its divisors is an integer number (12977935).

Almost surely, 2^51210157 is an apocalyptic number.

It is an amenable number.

51210157 is a deficient number, since it is larger than the sum of its proper divisors (701583).

51210157 is an equidigital number, since it uses as much as digits as its factorization.

51210157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701582.

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 51210157 is about 7156.1272347548. The cubic root of 51210157 is about 371.3516595539.

The spelling of 51210157 in words is "fifty-one million, two hundred ten thousand, one hundred fifty-seven".