51173149 has 2 divisors, whose sum is σ = 51173150. Its totient is φ = 51173148.

The previous prime is 51173123. The next prime is 51173153. The reversal of 51173149 is 94137115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39917124 + 11256025 = 6318^2 + 3355^2 .

It is a cyclic number.

It is not a de Polignac number, because 51173149 - 2⁵ = 51173117 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51173149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51173159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25586574 + 25586575.

It is an arithmetic number, because the mean of its divisors is an integer number (25586575).

Almost surely, 2^51173149 is an apocalyptic number.

It is an amenable number.

51173149 is a deficient number, since it is larger than the sum of its proper divisors (1).

51173149 is an equidigital number, since it uses as much as digits as its factorization.

51173149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 31.

The square root of 51173149 is about 7153.5410112755. The cubic root of 51173149 is about 371.2621832020.

The spelling of 51173149 in words is "fifty-one million, one hundred seventy-three thousand, one hundred forty-nine".