1225623491849 has 4 divisors (see below), whose sum is σ = 1290129991440. Its totient is φ = 1161116992260.

The previous prime is 1225623491819. The next prime is 1225623491867. The reversal of 1225623491849 is 9481943265221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225623491849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225623491794 and 1225623491803.

It is not an unprimeable number, because it can be changed into a prime (1225623491809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32253249767 + ... + 32253249804.

It is an arithmetic number, because the mean of its divisors is an integer number (322532497860).

Almost surely, 2^{1225623491849} is an apocalyptic number.

1225623491849 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1225623491849 is a deficient number, since it is larger than the sum of its proper divisors (64506499591).

1225623491849 is an equidigital number, since it uses as much as digits as its factorization.

1225623491849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64506499590.

The product of its digits is 7464960, while the sum is 56.

The spelling of 1225623491849 in words is "one trillion, two hundred twenty-five billion, six hundred twenty-three million, four hundred ninety-one thousand, eight hundred forty-nine".