51245149 has 2 divisors, whose sum is σ = 51245150. Its totient is φ = 51245148.

The previous prime is 51245141. The next prime is 51245209. The reversal of 51245149 is 94154215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51222649 + 22500 = 7157^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 51245149 - 2³ = 51245141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51245149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51245141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25622574 + 25622575.

It is an arithmetic number, because the mean of its divisors is an integer number (25622575).

Almost surely, 2^51245149 is an apocalyptic number.

It is an amenable number.

51245149 is a deficient number, since it is larger than the sum of its proper divisors (1).

51245149 is an equidigital number, since it uses as much as digits as its factorization.

51245149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 51245149 is about 7158.5717150840. The cubic root of 51245149 is about 371.4362220670.

The spelling of 51245149 in words is "fifty-one million, two hundred forty-five thousand, one hundred forty-nine".