12291557 has 2 divisors, whose sum is σ = 12291558. Its totient is φ = 12291556.

The previous prime is 12291547. The next prime is 12291577. The reversal of 12291557 is 75519221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12208036 + 83521 = 3494^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 12291557 - 2⁴ = 12291541 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12291547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6145778 + 6145779.

It is an arithmetic number, because the mean of its divisors is an integer number (6145779).

Almost surely, 2^12291557 is an apocalyptic number.

It is an amenable number.

12291557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12291557 is an equidigital number, since it uses as much as digits as its factorization.

12291557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 32.

The square root of 12291557 is about 3505.9316878684. The cubic root of 12291557 is about 230.7821950808.

The spelling of 12291557 in words is "twelve million, two hundred ninety-one thousand, five hundred fifty-seven".