1225717847 has 2 divisors, whose sum is σ = 1225717848. Its totient is φ = 1225717846.

The previous prime is 1225717813. The next prime is 1225717859. The reversal of 1225717847 is 7487175221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1225717847 - 2¹⁰ = 1225716823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1225717798 and 1225717807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225717807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612858923 + 612858924.

It is an arithmetic number, because the mean of its divisors is an integer number (612858924).

Almost surely, 2^1225717847 is an apocalyptic number.

1225717847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225717847 is an equidigital number, since it uses as much as digits as its factorization.

1225717847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 219520, while the sum is 44.

The square root of 1225717847 is about 35010.2534552379. The cubic root of 1225717847 is about 1070.1964431010.

The spelling of 1225717847 in words is "one billion, two hundred twenty-five million, seven hundred seventeen thousand, eight hundred forty-seven".