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11811431 is a prime number
BaseRepresentation
bin101101000011…
…101001100111
3211020002020102
4231003221213
511010431211
61101054315
7202252442
oct55035147
924202212
1011811431
116738115
123b5739b
1325a7218
1417d6659
151084a3b
hexb43a67

11811431 has 2 divisors, whose sum is σ = 11811432. Its totient is φ = 11811430.

The previous prime is 11811427. The next prime is 11811433. The reversal of 11811431 is 13411811.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11811431 - 22 = 11811427 is a prime.

It is a super-2 number, since 2×118114312 = 279019804535522, which contains 22 as substring.

Together with 11811433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11811433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5905715 + 5905716.

It is an arithmetic number, because the mean of its divisors is an integer number (5905716).

Almost surely, 211811431 is an apocalyptic number.

11811431 is a deficient number, since it is larger than the sum of its proper divisors (1).

11811431 is an equidigital number, since it uses as much as digits as its factorization.

11811431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 20.

The square root of 11811431 is about 3436.7762510818. The cubic root of 11811431 is about 227.7373026017.

The spelling of 11811431 in words is "eleven million, eight hundred eleven thousand, four hundred thirty-one".