11821031 has 2 divisors, whose sum is σ = 11821032. Its totient is φ = 11821030.

The previous prime is 11821027. The next prime is 11821081. The reversal of 11821031 is 13012811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11821031 - 2² = 11821027 is a prime.

It is a super-2 number, since 2×11821031² = 279473547805922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11821081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5910515 + 5910516.

It is an arithmetic number, because the mean of its divisors is an integer number (5910516).

Almost surely, 2^11821031 is an apocalyptic number.

11821031 is a deficient number, since it is larger than the sum of its proper divisors (1).

11821031 is an equidigital number, since it uses as much as digits as its factorization.

11821031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 11821031 is about 3438.1726251019. The cubic root of 11821031 is about 227.7989853918.

Adding to 11821031 its reverse (13012811), we get a palindrome (24833842).

The spelling of 11821031 in words is "eleven million, eight hundred twenty-one thousand, thirty-one".