1225243409 has 6 divisors (see below), whose sum is σ = 1326743046. Its totient is φ = 1130993760.

The previous prime is 1225243403. The next prime is 1225243421. The reversal of 1225243409 is 9043425221.

It can be written as a sum of positive squares in 3 ways, for example, as 17472400 + 1207771009 = 4180^2 + 34753^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1225243409 is a prime.

It is a super-2 number, since 2×1225243409² = 3002442822595882562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225243403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3624812 + ... + 3625149.

It is an arithmetic number, because the mean of its divisors is an integer number (221123841).

Almost surely, 2^1225243409 is an apocalyptic number.

It is an amenable number.

1225243409 is a deficient number, since it is larger than the sum of its proper divisors (101499637).

1225243409 is an equidigital number, since it uses as much as digits as its factorization.

1225243409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7249987 (or 7249974 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1225243409 is about 35003.4770987112. The cubic root of 1225243409 is about 1070.0583451459.

The spelling of 1225243409 in words is "one billion, two hundred twenty-five million, two hundred forty-three thousand, four hundred nine".