2631281 has 2 divisors, whose sum is σ = 2631282. Its totient is φ = 2631280.

The previous prime is 2631271. The next prime is 2631283. The reversal of 2631281 is 1821362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2202256 + 429025 = 1484^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 2631281 - 2⁶ = 2631217 is a prime.

It is a super-2 number, since 2×2631281² = 13847279401922, which contains 22 as substring.

Together with 2631283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2631283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315640 + 1315641.

It is an arithmetic number, because the mean of its divisors is an integer number (1315641).

2^2631281 is an apocalyptic number.

It is an amenable number.

2631281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2631281 is an equidigital number, since it uses as much as digits as its factorization.

2631281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

The square root of 2631281 is about 1622.1223751616. The cubic root of 2631281 is about 138.0561453261.

The spelling of 2631281 in words is "two million, six hundred thirty-one thousand, two hundred eighty-one".