51163649 has 2 divisors, whose sum is σ = 51163650. Its totient is φ = 51163648.

The previous prime is 51163643. The next prime is 51163687. The reversal of 51163649 is 94636115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48205249 + 2958400 = 6943^2 + 1720^2 .

It is a cyclic number.

It is not a de Polignac number, because 51163649 - 2¹² = 51159553 is a prime.

It is not a weakly prime, because it can be changed into another prime (51163643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25581824 + 25581825.

It is an arithmetic number, because the mean of its divisors is an integer number (25581825).

Almost surely, 2^51163649 is an apocalyptic number.

It is an amenable number.

51163649 is a deficient number, since it is larger than the sum of its proper divisors (1).

51163649 is an equidigital number, since it uses as much as digits as its factorization.

51163649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 35.

The square root of 51163649 is about 7152.8769736380. The cubic root of 51163649 is about 371.2392075524.

The spelling of 51163649 in words is "fifty-one million, one hundred sixty-three thousand, six hundred forty-nine".