51288649 has 2 divisors, whose sum is σ = 51288650. Its totient is φ = 51288648.

The previous prime is 51288613. The next prime is 51288661. The reversal of 51288649 is 94688215.

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., 42994249 + 8294400 = 6557^2 + 2880^2 .

It is a cyclic number.

It is not a de Polignac number, because 51288649 - 2⁷ = 51288521 is a prime.

It is not a weakly prime, because it can be changed into another prime (51288449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25644324 + 25644325.

It is an arithmetic number, because the mean of its divisors is an integer number (25644325).

Almost surely, 2^51288649 is an apocalyptic number.

It is an amenable number.

51288649 is a deficient number, since it is larger than the sum of its proper divisors (1).

51288649 is an equidigital number, since it uses as much as digits as its factorization.

51288649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 43.

The square root of 51288649 is about 7161.6093861645. The cubic root of 51288649 is about 371.5412915634.

The spelling of 51288649 in words is "fifty-one million, two hundred eighty-eight thousand, six hundred forty-nine".