1301621281 has 2 divisors, whose sum is σ = 1301621282. Its totient is φ = 1301621280.

The previous prime is 1301621257. The next prime is 1301621291. The reversal of 1301621281 is 1821261031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1289959056 + 11662225 = 35916^2 + 3415^2 .

It is an emirp because it is prime and its reverse (1821261031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1301621281 - 2¹⁵ = 1301588513 is a prime.

It is a super-2 number, since 2×1301621281² = 3388435918304161922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1301621291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 650810640 + 650810641.

It is an arithmetic number, because the mean of its divisors is an integer number (650810641).

Almost surely, 2^1301621281 is an apocalyptic number.

It is an amenable number.

1301621281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1301621281 is an equidigital number, since it uses as much as digits as its factorization.

1301621281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1301621281 is about 36077.9888713326. The cubic root of 1301621281 is about 1091.8464008736.

The spelling of 1301621281 in words is "one billion, three hundred one million, six hundred twenty-one thousand, two hundred eighty-one".