1220325551 has 2 divisors, whose sum is σ = 1220325552. Its totient is φ = 1220325550.

The previous prime is 1220325541. The next prime is 1220325553. The reversal of 1220325551 is 1555230221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220325551 - 2¹⁸ = 1220063407 is a prime.

Together with 1220325553, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220325551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220325553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610162775 + 610162776.

It is an arithmetic number, because the mean of its divisors is an integer number (610162776).

Almost surely, 2^1220325551 is an apocalyptic number.

1220325551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220325551 is an equidigital number, since it uses as much as digits as its factorization.

1220325551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 1220325551 is about 34933.1583313047. The cubic root of 1220325551 is about 1068.6247656639.

Adding to 1220325551 its reverse (1555230221), we get a palindrome (2775555772).

The spelling of 1220325551 in words is "one billion, two hundred twenty million, three hundred twenty-five thousand, five hundred fifty-one".