1220113651 has 2 divisors, whose sum is σ = 1220113652. Its totient is φ = 1220113650.

The previous prime is 1220113649. The next prime is 1220113693. The reversal of 1220113651 is 1563110221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220113651 - 2¹ = 1220113649 is a prime.

Together with 1220113649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1220117651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610056825 + 610056826.

It is an arithmetic number, because the mean of its divisors is an integer number (610056826).

Almost surely, 2^1220113651 is an apocalyptic number.

1220113651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220113651 is an equidigital number, since it uses as much as digits as its factorization.

1220113651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 1220113651 is about 34930.1252645907. The cubic root of 1220113651 is about 1068.5629093023.

Adding to 1220113651 its reverse (1563110221), we get a palindrome (2783223872).

It can be divided in two parts, 12201 and 13651, that added together give a palindrome (25852).

The spelling of 1220113651 in words is "one billion, two hundred twenty million, one hundred thirteen thousand, six hundred fifty-one".