11951947 has 4 divisors (see below), whose sum is σ = 13659376. Its totient is φ = 10244520.

The previous prime is 11951923. The next prime is 11951963. The reversal of 11951947 is 74915911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74915911 = 7 ⋅10702273.

It is a cyclic number.

It is not a de Polignac number, because 11951947 - 2¹⁹ = 11427659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11951987) 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, 853704 + ... + 853717.

It is an arithmetic number, because the mean of its divisors is an integer number (3414844).

Almost surely, 2^11951947 is an apocalyptic number.

11951947 is a deficient number, since it is larger than the sum of its proper divisors (1707429).

11951947 is an equidigital number, since it uses as much as digits as its factorization.

11951947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1707428.

The product of its digits is 11340, while the sum is 37.

The square root of 11951947 is about 3457.1588045677. The cubic root of 11951947 is about 228.6368455059.

The spelling of 11951947 in words is "eleven million, nine hundred fifty-one thousand, nine hundred forty-seven".