51601601 has 2 divisors, whose sum is σ = 51601602. Its totient is φ = 51601600.

The previous prime is 51601567. The next prime is 51601603. The reversal of 51601601 is 10610615.

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., 49336576 + 2265025 = 7024^2 + 1505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51601601 is a prime.

It is a Sophie Germain prime.

Together with 51601603, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51601603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25800800 + 25800801.

It is an arithmetic number, because the mean of its divisors is an integer number (25800801).

Almost surely, 2^51601601 is an apocalyptic number.

It is an amenable number.

51601601 is a deficient number, since it is larger than the sum of its proper divisors (1).

51601601 is an equidigital number, since it uses as much as digits as its factorization.

51601601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 51601601 is about 7183.4254363778. The cubic root of 51601601 is about 372.2954473531.

The spelling of 51601601 in words is "fifty-one million, six hundred one thousand, six hundred one".