12291797 has 6 divisors (see below), whose sum is σ = 14298678. Its totient is φ = 10535784.

The previous prime is 12291793. The next prime is 12291809. The reversal of 12291797 is 79719221.

It can be written as a sum of positive squares in only one way, i.e., 12103441 + 188356 = 3479^2 + 434^2 .

It is not a de Polignac number, because 12291797 - 2² = 12291793 is a prime.

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 12291797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12291791) 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, 125378 + ... + 125475.

It is an arithmetic number, because the mean of its divisors is an integer number (2383113).

Almost surely, 2^12291797 is an apocalyptic number.

It is an amenable number.

12291797 is a deficient number, since it is larger than the sum of its proper divisors (2006881).

12291797 is an equidigital number, since it uses as much as digits as its factorization.

12291797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250867 (or 250860 counting only the distinct ones).

The product of its digits is 15876, while the sum is 38.

The square root of 12291797 is about 3505.9659154076. The cubic root of 12291797 is about 230.7836971245.

It can be divided in two parts, 122 and 91797, that added together give a palindrome (91919).

The spelling of 12291797 in words is "twelve million, two hundred ninety-one thousand, seven hundred ninety-seven".