12291861949 has 2 divisors, whose sum is σ = 12291861950. Its totient is φ = 12291861948.

The previous prime is 12291861947. The next prime is 12291861991. The reversal of 12291861949 is 94916819221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11367397924 + 924464025 = 106618^2 + 30405^2 .

It is a cyclic number.

It is not a de Polignac number, because 12291861949 - 2¹ = 12291861947 is a prime.

Together with 12291861947, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12291861896 and 12291861905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12291861941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6145930974 + 6145930975.

It is an arithmetic number, because the mean of its divisors is an integer number (6145930975).

Almost surely, 2^12291861949 is an apocalyptic number.

It is an amenable number.

12291861949 is a deficient number, since it is larger than the sum of its proper divisors (1).

12291861949 is an equidigital number, since it uses as much as digits as its factorization.

12291861949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 52.

The spelling of 12291861949 in words is "twelve billion, two hundred ninety-one million, eight hundred sixty-one thousand, nine hundred forty-nine".