1225242143 has 2 divisors, whose sum is σ = 1225242144. Its totient is φ = 1225242142.

The previous prime is 1225242133. The next prime is 1225242167. The reversal of 1225242143 is 3412425221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1225242143 - 2²⁴ = 1208464927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225242133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612621071 + 612621072.

It is an arithmetic number, because the mean of its divisors is an integer number (612621072).

Almost surely, 2^1225242143 is an apocalyptic number.

1225242143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225242143 is an equidigital number, since it uses as much as digits as its factorization.

1225242143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 26.

The square root of 1225242143 is about 35003.4590147888. The cubic root of 1225242143 is about 1070.0579765948.

Adding to 1225242143 its reverse (3412425221), we get a palindrome (4637667364).

The spelling of 1225242143 in words is "one billion, two hundred twenty-five million, two hundred forty-two thousand, one hundred forty-three".