31544351223449 has 2 divisors, whose sum is σ = 31544351223450. Its totient is φ = 31544351223448.

The previous prime is 31544351223377. The next prime is 31544351223461. The reversal of 31544351223449 is 94432215344513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22251334305424 + 9293016918025 = 4717132^2 + 3048445^2 .

It is an emirp because it is prime and its reverse (94432215344513) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31544351223449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31544351223397 and 31544351223406.

It is not a weakly prime, because it can be changed into another prime (31544351223149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15772175611724 + 15772175611725.

It is an arithmetic number, because the mean of its divisors is an integer number (15772175611725).

Almost surely, 2^{31544351223449} is an apocalyptic number.

It is an amenable number.

31544351223449 is a deficient number, since it is larger than the sum of its proper divisors (1).

31544351223449 is an equidigital number, since it uses as much as digits as its factorization.

31544351223449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6220800, while the sum is 50.

The spelling of 31544351223449 in words is "thirty-one trillion, five hundred forty-four billion, three hundred fifty-one million, two hundred twenty-three thousand, four hundred forty-nine".