11005951 has 4 divisors (see below), whose sum is σ = 12006504. Its totient is φ = 10005400.

The previous prime is 11005949. The next prime is 11005957. The reversal of 11005951 is 15950011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11005951 - 2¹ = 11005949 is a prime.

It is a super-2 number, since 2×11005951² = 242261914828802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11005957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500260 + ... + 500281.

It is an arithmetic number, because the mean of its divisors is an integer number (3001626).

Almost surely, 2^11005951 is an apocalyptic number.

11005951 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11005951 is a deficient number, since it is larger than the sum of its proper divisors (1000553).

11005951 is a wasteful number, since it uses less digits than its factorization.

11005951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000552.

The product of its (nonzero) digits is 225, while the sum is 22.

The square root of 11005951 is about 3317.5218160549. The cubic root of 11005951 is about 222.4381076010.

Adding to 11005951 its reverse (15950011), we get a palindrome (26955962).

The spelling of 11005951 in words is "eleven million, five thousand, nine hundred fifty-one".