1220431549 has 2 divisors, whose sum is σ = 1220431550. Its totient is φ = 1220431548.

The previous prime is 1220431523. The next prime is 1220431561. The reversal of 1220431549 is 9451340221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 637209049 + 583222500 = 25243^2 + 24150^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220431549 - 2⁵ = 1220431517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220431549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220431349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610215774 + 610215775.

It is an arithmetic number, because the mean of its divisors is an integer number (610215775).

Almost surely, 2^1220431549 is an apocalyptic number.

It is an amenable number.

1220431549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220431549 is an equidigital number, since it uses as much as digits as its factorization.

1220431549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1220431549 is about 34934.6754529078. The cubic root of 1220431549 is about 1068.6557051697.

The spelling of 1220431549 in words is "one billion, two hundred twenty million, four hundred thirty-one thousand, five hundred forty-nine".