1220231551 has 16 divisors (see below), whose sum is σ = 1540592640. Its totient is φ = 938789280.

The previous prime is 1220231527. The next prime is 1220231557. The reversal of 1220231551 is 1551320221.

It is not a de Polignac number, because 1220231551 - 2⁹ = 1220231039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220231557) 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 in 15 ways as a sum of consecutive naturals, for example, 94216 + ... + 106381.

It is an arithmetic number, because the mean of its divisors is an integer number (96287040).

Almost surely, 2^1220231551 is an apocalyptic number.

1220231551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220231551 is a deficient number, since it is larger than the sum of its proper divisors (320361089).

1220231551 is a wasteful number, since it uses less digits than its factorization.

1220231551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200694.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1220231551 is about 34931.8128788072. The cubic root of 1220231551 is about 1068.5973267271.

Adding to 1220231551 its reverse (1551320221), we get a palindrome (2771551772).

The spelling of 1220231551 in words is "one billion, two hundred twenty million, two hundred thirty-one thousand, five hundred fifty-one".