1245223549 has 2 divisors, whose sum is σ = 1245223550. Its totient is φ = 1245223548.

The previous prime is 1245223523. The next prime is 1245223559. The reversal of 1245223549 is 9453225421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1223740324 + 21483225 = 34982^2 + 4635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245223549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245223559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622611774 + 622611775.

It is an arithmetic number, because the mean of its divisors is an integer number (622611775).

Almost surely, 2^1245223549 is an apocalyptic number.

It is an amenable number.

1245223549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245223549 is an equidigital number, since it uses as much as digits as its factorization.

1245223549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 37.

The square root of 1245223549 is about 35287.7251887962. The cubic root of 1245223549 is about 1075.8435200946.

The spelling of 1245223549 in words is "one billion, two hundred forty-five million, two hundred twenty-three thousand, five hundred forty-nine".