61301281 has 2 divisors, whose sum is σ = 61301282. Its totient is φ = 61301280.

The previous prime is 61301237. The next prime is 61301297. The reversal of 61301281 is 18210316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60217600 + 1083681 = 7760^2 + 1041^2 .

It is a cyclic number.

It is not a de Polignac number, because 61301281 - 2⁹ = 61300769 is a prime.

It is a super-3 number, since 3×61301281³ (a number of 24 digits) contains 333 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 (61311281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30650640 + 30650641.

It is an arithmetic number, because the mean of its divisors is an integer number (30650641).

Almost surely, 2^61301281 is an apocalyptic number.

It is an amenable number.

61301281 is a deficient number, since it is larger than the sum of its proper divisors (1).

61301281 is an equidigital number, since it uses as much as digits as its factorization.

61301281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 61301281 is about 7829.5134587023. The cubic root of 61301281 is about 394.2967372157.

Adding to 61301281 its reverse (18210316), we get a palindrome (79511597).

The spelling of 61301281 in words is "sixty-one million, three hundred one thousand, two hundred eighty-one".