1223072251 has 2 divisors, whose sum is σ = 1223072252. Its totient is φ = 1223072250.

The previous prime is 1223072209. The next prime is 1223072273. The reversal of 1223072251 is 1522703221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223072251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1223072551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611536125 + 611536126.

It is an arithmetic number, because the mean of its divisors is an integer number (611536126).

Almost surely, 2^1223072251 is an apocalyptic number.

1223072251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223072251 is an equidigital number, since it uses as much as digits as its factorization.

1223072251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 1223072251 is about 34972.4498855885. The cubic root of 1223072251 is about 1069.4259158766.

Adding to 1223072251 its reverse (1522703221), we get a palindrome (2745775472).

The spelling of 1223072251 in words is "one billion, two hundred twenty-three million, seventy-two thousand, two hundred fifty-one".