11912831 has 6 divisors (see below), whose sum is σ = 13857840. Its totient is φ = 10210956.

The previous prime is 11912821. The next prime is 11912839. The reversal of 11912831 is 13821911.

It is not a de Polignac number, because 11912831 - 2¹⁰ = 11911807 is a prime.

It is a super-2 number, since 2×11912831² = 283831084869122, which contains 22 as substring.

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 11912831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11912839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 121511 + ... + 121608.

It is an arithmetic number, because the mean of its divisors is an integer number (2309640).

Almost surely, 2^11912831 is an apocalyptic number.

11912831 is a deficient number, since it is larger than the sum of its proper divisors (1945009).

11912831 is an equidigital number, since it uses as much as digits as its factorization.

11912831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243133 (or 243126 counting only the distinct ones).

The product of its digits is 432, while the sum is 26.

The square root of 11912831 is about 3451.4969216269. The cubic root of 11912831 is about 228.3871474677.

The spelling of 11912831 in words is "eleven million, nine hundred twelve thousand, eight hundred thirty-one".