11281631 has 2 divisors, whose sum is σ = 11281632. Its totient is φ = 11281630.

The previous prime is 11281607. The next prime is 11281637. The reversal of 11281631 is 13618211.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11281631 is a prime.

It is a super-2 number, since 2×11281631² = 254550396040322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 11281597 and 11281606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11281637) 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, 5640815 + 5640816.

It is an arithmetic number, because the mean of its divisors is an integer number (5640816).

Almost surely, 2^11281631 is an apocalyptic number.

11281631 is a deficient number, since it is larger than the sum of its proper divisors (1).

11281631 is an equidigital number, since it uses as much as digits as its factorization.

11281631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 23.

The square root of 11281631 is about 3358.8139275643. The cubic root of 11281631 is about 224.2800427638.

Adding to 11281631 its reverse (13618211), we get a palindrome (24899842).

The spelling of 11281631 in words is "eleven million, two hundred eighty-one thousand, six hundred thirty-one".