11947951 has 4 divisors (see below), whose sum is σ = 12116304. Its totient is φ = 11779600.

The previous prime is 11947931. The next prime is 11947961. The reversal of 11947951 is 15974911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15974911 = 29 ⋅550859.

It is a cyclic number.

It is not a de Polignac number, because 11947951 - 2²³ = 3559343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11947951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11947931) 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, 84070 + ... + 84211.

It is an arithmetic number, because the mean of its divisors is an integer number (3029076).

Almost surely, 2^11947951 is an apocalyptic number.

11947951 is a deficient number, since it is larger than the sum of its proper divisors (168353).

11947951 is an equidigital number, since it uses as much as digits as its factorization.

11947951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168352.

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

The square root of 11947951 is about 3456.5808250351. The cubic root of 11947951 is about 228.6113619403.

The spelling of 11947951 in words is "eleven million, nine hundred forty-seven thousand, nine hundred fifty-one".