50251681 has 2 divisors, whose sum is σ = 50251682. Its totient is φ = 50251680.

The previous prime is 50251639. The next prime is 50251687. The reversal of 50251681 is 18615205.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46580625 + 3671056 = 6825^2 + 1916^2 .

It is a cyclic number.

It is not a de Polignac number, because 50251681 - 2¹³ = 50243489 is a prime.

It is a super-4 number, since 4×50251681⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (50251687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25125840 + 25125841.

It is an arithmetic number, because the mean of its divisors is an integer number (25125841).

Almost surely, 2^50251681 is an apocalyptic number.

It is an amenable number.

50251681 is a deficient number, since it is larger than the sum of its proper divisors (1).

50251681 is an equidigital number, since it uses as much as digits as its factorization.

50251681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 50251681 is about 7088.8420069853. The cubic root of 50251681 is about 369.0202494255.

Adding to 50251681 its reverse (18615205), we get a palindrome (68866886).

The spelling of 50251681 in words is "fifty million, two hundred fifty-one thousand, six hundred eighty-one".