12291533 has 2 divisors, whose sum is σ = 12291534. Its totient is φ = 12291532.

The previous prime is 12291497. The next prime is 12291541. The reversal of 12291533 is 33519221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9721924 + 2569609 = 3118^2 + 1603^2 .

It is a cyclic number.

It is not a de Polignac number, because 12291533 - 2⁸ = 12291277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12297533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6145766 + 6145767.

It is an arithmetic number, because the mean of its divisors is an integer number (6145767).

Almost surely, 2^12291533 is an apocalyptic number.

It is an amenable number.

12291533 is a deficient number, since it is larger than the sum of its proper divisors (1).

12291533 is an equidigital number, since it uses as much as digits as its factorization.

12291533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 26.

The square root of 12291533 is about 3505.9282650961. The cubic root of 12291533 is about 230.7820448753.

The spelling of 12291533 in words is "twelve million, two hundred ninety-one thousand, five hundred thirty-three".