1223601551 has 2 divisors, whose sum is σ = 1223601552. Its totient is φ = 1223601550.

The previous prime is 1223601529. The next prime is 1223601563. The reversal of 1223601551 is 1551063221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1223601551 - 2¹⁰ = 1223600527 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1223601551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223601751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611800775 + 611800776.

It is an arithmetic number, because the mean of its divisors is an integer number (611800776).

Almost surely, 2^1223601551 is an apocalyptic number.

1223601551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223601551 is an equidigital number, since it uses as much as digits as its factorization.

1223601551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1223601551 is about 34980.0164522546. The cubic root of 1223601551 is about 1069.5801628291.

Adding to 1223601551 its reverse (1551063221), we get a palindrome (2774664772).

The spelling of 1223601551 in words is "one billion, two hundred twenty-three million, six hundred one thousand, five hundred fifty-one".