1018221551 has 2 divisors, whose sum is σ = 1018221552. Its totient is φ = 1018221550.

The previous prime is 1018221527. The next prime is 1018221557. The reversal of 1018221551 is 1551228101.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1018221551 is a prime.

It is a super-3 number, since 3×1018221551³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1018221551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1018221557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509110775 + 509110776.

It is an arithmetic number, because the mean of its divisors is an integer number (509110776).

Almost surely, 2^1018221551 is an apocalyptic number.

1018221551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1018221551 is an equidigital number, since it uses as much as digits as its factorization.

1018221551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 26.

The square root of 1018221551 is about 31909.5839991687. The cubic root of 1018221551 is about 1006.0373276559.

Adding to 1018221551 its reverse (1551228101), we get a palindrome (2569449652).

The spelling of 1018221551 in words is "one billion, eighteen million, two hundred twenty-one thousand, five hundred fifty-one".