1225425543 has 4 divisors (see below), whose sum is σ = 1633900728. Its totient is φ = 816950360.

The previous prime is 1225425527. The next prime is 1225425557. The reversal of 1225425543 is 3455245221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3455245221 = 3 ⋅1151748407.

It is a cyclic number.

It is not a de Polignac number, because 1225425543 - 2⁴ = 1225425527 is a prime.

It is a super-2 number, since 2×1225425543² = 3003335522873689698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225425503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204237588 + ... + 204237593.

It is an arithmetic number, because the mean of its divisors is an integer number (408475182).

Almost surely, 2^1225425543 is an apocalyptic number.

1225425543 is a deficient number, since it is larger than the sum of its proper divisors (408475185).

1225425543 is an equidigital number, since it uses as much as digits as its factorization.

1225425543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408475184.

The product of its digits is 48000, while the sum is 33.

The square root of 1225425543 is about 35006.0786578560. The cubic root of 1225425543 is about 1070.1113643661. Note that the first 3 decimals are identical.

The spelling of 1225425543 in words is "one billion, two hundred twenty-five million, four hundred twenty-five thousand, five hundred forty-three".