1223424157 has 2 divisors, whose sum is σ = 1223424158. Its totient is φ = 1223424156.

The previous prime is 1223424151. The next prime is 1223424179. The reversal of 1223424157 is 7514243221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 860483556 + 362940601 = 29334^2 + 19051^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223424157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223424151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611712078 + 611712079.

It is an arithmetic number, because the mean of its divisors is an integer number (611712079).

Almost surely, 2^1223424157 is an apocalyptic number.

It is an amenable number.

1223424157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223424157 is an equidigital number, since it uses as much as digits as its factorization.

1223424157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 31.

The square root of 1223424157 is about 34977.4807125956. The cubic root of 1223424157 is about 1069.5284721805.

Adding to 1223424157 its reverse (7514243221), we get a palindrome (8737667378).

The spelling of 1223424157 in words is "one billion, two hundred twenty-three million, four hundred twenty-four thousand, one hundred fifty-seven".