1220231461 has 4 divisors (see below), whose sum is σ = 1220677452. Its totient is φ = 1219785472.

The previous prime is 1220231447. The next prime is 1220231479. The reversal of 1220231461 is 1641320221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1641320221 = 29 ⋅56597249.

It can be written as a sum of positive squares in 2 ways, for example, as 1053976225 + 166255236 = 32465^2 + 12894^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220231461 - 2¹⁹ = 1219707173 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 (1220231261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218866 + ... + 224371.

It is an arithmetic number, because the mean of its divisors is an integer number (305169363).

Almost surely, 2^1220231461 is an apocalyptic number.

It is an amenable number.

1220231461 is a deficient number, since it is larger than the sum of its proper divisors (445991).

1220231461 is an equidigital number, since it uses as much as digits as its factorization.

1220231461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445990.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1220231461 is about 34931.8115905832. The cubic root of 1220231461 is about 1068.5973004551.

Adding to 1220231461 its reverse (1641320221), we get a palindrome (2861551682).

The spelling of 1220231461 in words is "one billion, two hundred twenty million, two hundred thirty-one thousand, four hundred sixty-one".