1225709443 has 4 divisors (see below), whose sum is σ = 1400810800. Its totient is φ = 1050608088.

The previous prime is 1225709413. The next prime is 1225709461. The reversal of 1225709443 is 3449075221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1225709443 - 2¹³ = 1225701251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225709413) 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, 87550668 + ... + 87550681.

It is an arithmetic number, because the mean of its divisors is an integer number (350202700).

Almost surely, 2^1225709443 is an apocalyptic number.

1225709443 is a deficient number, since it is larger than the sum of its proper divisors (175101357).

1225709443 is an equidigital number, since it uses as much as digits as its factorization.

1225709443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175101356.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 1225709443 is about 35010.1334330505. The cubic root of 1225709443 is about 1070.1939972005.

The spelling of 1225709443 in words is "one billion, two hundred twenty-five million, seven hundred nine thousand, four hundred forty-three".