1423221157 has 2 divisors, whose sum is σ = 1423221158. Its totient is φ = 1423221156.

The previous prime is 1423221127. The next prime is 1423221167. The reversal of 1423221157 is 7511223241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1095212836 + 328008321 = 33094^2 + 18111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1423221157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1423221127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 711610578 + 711610579.

It is an arithmetic number, because the mean of its divisors is an integer number (711610579).

Almost surely, 2^1423221157 is an apocalyptic number.

It is an amenable number.

1423221157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1423221157 is an equidigital number, since it uses as much as digits as its factorization.

1423221157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 28.

The square root of 1423221157 is about 37725.6034676717. The cubic root of 1423221157 is about 1124.8401173941.

Adding to 1423221157 its reverse (7511223241), we get a palindrome (8934444398).

The spelling of 1423221157 in words is "one billion, four hundred twenty-three million, two hundred twenty-one thousand, one hundred fifty-seven".