11111947 has 8 divisors (see below), whose sum is σ = 13853952. Its totient is φ = 8658600.

The previous prime is 11111923. The next prime is 11111953. The reversal of 11111947 is 74911111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11111947 - 2⁷ = 11111819 is a prime.

It is a super-2 number, since 2×11111947² = 246950732261618, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11111977) 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 7 ways as a sum of consecutive naturals, for example, 72079 + ... + 72232.

It is an arithmetic number, because the mean of its divisors is an integer number (1731744).

Almost surely, 2^11111947 is an apocalyptic number.

11111947 is a deficient number, since it is larger than the sum of its proper divisors (2742005).

11111947 is a wasteful number, since it uses less digits than its factorization.

11111947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144329.

The product of its digits is 252, while the sum is 25.

The square root of 11111947 is about 3333.4587143086. The cubic root of 11111947 is about 223.1499122694.

The spelling of 11111947 in words is "eleven million, one hundred eleven thousand, nine hundred forty-seven".