1246221157 has 2 divisors, whose sum is σ = 1246221158. Its totient is φ = 1246221156.

The previous prime is 1246221139. The next prime is 1246221169. The reversal of 1246221157 is 7511226421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 647244481 + 598976676 = 25441^2 + 24474^2 .

It is a cyclic number.

It is not a de Polignac number, because 1246221157 - 2¹¹ = 1246219109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1246221107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623110578 + 623110579.

It is an arithmetic number, because the mean of its divisors is an integer number (623110579).

Almost surely, 2^1246221157 is an apocalyptic number.

It is an amenable number.

1246221157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1246221157 is an equidigital number, since it uses as much as digits as its factorization.

1246221157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

The square root of 1246221157 is about 35301.8576989937. The cubic root of 1246221157 is about 1076.1307465970.

Adding to 1246221157 its reverse (7511226421), we get a palindrome (8757447578).

The spelling of 1246221157 in words is "one billion, two hundred forty-six million, two hundred twenty-one thousand, one hundred fifty-seven".