11621281 has 9 divisors (see below), whose sum is σ = 13546449. Its totient is φ = 9940644.

The previous prime is 11621273. The next prime is 11621303. The reversal of 11621281 is 18212611.

The square root of 11621281 is 3409.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 11621281 - 2³ = 11621273 is a prime.

It is a super-2 number, since 2×11621281² = 270108344161922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11621201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 23620 + ... + 24106.

It is an arithmetic number, because the mean of its divisors is an integer number (1505161).

Almost surely, 2^11621281 is an apocalyptic number.

11621281 is the 3409-th square number.

11621281 is the 1705-th centered octagonal number.

It is an amenable number.

11621281 is a deficient number, since it is larger than the sum of its proper divisors (1925168).

11621281 is an frugal number, since it uses more digits than its factorization.

11621281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988 (or 494 counting only the distinct ones).

The product of its digits is 192, while the sum is 22.

The cubic root of 11621281 is about 226.5085852304.

Adding to 11621281 its reverse (18212611), we get a palindrome (29833892).

The spelling of 11621281 in words is "eleven million, six hundred twenty-one thousand, two hundred eighty-one".