51995137 has 4 divisors (see below), whose sum is σ = 52222420. Its totient is φ = 51767856.

The previous prime is 51995131. The next prime is 51995143. The reversal of 51995137 is 73159915.

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

It is an interprime number because it is at equal distance from previous prime (51995131) and next prime (51995143).

It can be written as a sum of positive squares in 2 ways, for example, as 27552001 + 24443136 = 5249^2 + 4944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51995137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51995137.

It is not an unprimeable number, because it can be changed into a prime (51995131) 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, 113298 + ... + 113755.

It is an arithmetic number, because the mean of its divisors is an integer number (13055605).

Almost surely, 2^51995137 is an apocalyptic number.

It is an amenable number.

51995137 is a deficient number, since it is larger than the sum of its proper divisors (227283).

51995137 is a wasteful number, since it uses less digits than its factorization.

51995137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227282.

The product of its digits is 42525, while the sum is 40.

The square root of 51995137 is about 7210.7653546624. The cubic root of 51995137 is about 373.2394799333.

The spelling of 51995137 in words is "fifty-one million, nine hundred ninety-five thousand, one hundred thirty-seven".