51015949 has 2 divisors, whose sum is σ = 51015950. Its totient is φ = 51015948.

The previous prime is 51015907. The next prime is 51015953. The reversal of 51015949 is 94951015.

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., 38975049 + 12040900 = 6243^2 + 3470^2 .

It is a cyclic number.

It is not a de Polignac number, because 51015949 - 2¹¹ = 51013901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51015749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25507974 + 25507975.

It is an arithmetic number, because the mean of its divisors is an integer number (25507975).

Almost surely, 2^51015949 is an apocalyptic number.

It is an amenable number.

51015949 is a deficient number, since it is larger than the sum of its proper divisors (1).

51015949 is an equidigital number, since it uses as much as digits as its factorization.

51015949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 51015949 is about 7142.5449946080. The cubic root of 51015949 is about 370.8816302482.

The spelling of 51015949 in words is "fifty-one million, fifteen thousand, nine hundred forty-nine".