11402581 has 2 divisors, whose sum is σ = 11402582. Its totient is φ = 11402580.

The previous prime is 11402569. The next prime is 11402627. The reversal of 11402581 is 18520411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9400356 + 2002225 = 3066^2 + 1415^2 .

It is a cyclic number.

It is not a de Polignac number, because 11402581 - 2¹¹ = 11400533 is a prime.

It is a super-2 number, since 2×11402581² = 260037706923122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11402561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5701290 + 5701291.

It is an arithmetic number, because the mean of its divisors is an integer number (5701291).

Almost surely, 2^11402581 is an apocalyptic number.

It is an amenable number.

11402581 is a deficient number, since it is larger than the sum of its proper divisors (1).

11402581 is an equidigital number, since it uses as much as digits as its factorization.

11402581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 11402581 is about 3376.7707947091. The cubic root of 11402581 is about 225.0786951064.

Adding to 11402581 its reverse (18520411), we get a palindrome (29922992).

It can be divided in two parts, 1140 and 2581, that added together give a square (3721 = 61²).

The spelling of 11402581 in words is "eleven million, four hundred two thousand, five hundred eighty-one".