51812149 has 2 divisors, whose sum is σ = 51812150. Its totient is φ = 51812148.

The previous prime is 51812143. The next prime is 51812153. The reversal of 51812149 is 94121815.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51739249 + 72900 = 7193^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 51812149 - 2⁹ = 51811637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51812149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51812143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25906074 + 25906075.

It is an arithmetic number, because the mean of its divisors is an integer number (25906075).

Almost surely, 2^51812149 is an apocalyptic number.

It is an amenable number.

51812149 is a deficient number, since it is larger than the sum of its proper divisors (1).

51812149 is an equidigital number, since it uses as much as digits as its factorization.

51812149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 31.

The square root of 51812149 is about 7198.0656429349. The cubic root of 51812149 is about 372.8011144221.

The spelling of 51812149 in words is "fifty-one million, eight hundred twelve thousand, one hundred forty-nine".