1553622409 has 2 divisors, whose sum is σ = 1553622410. Its totient is φ = 1553622408.

The previous prime is 1553622407. The next prime is 1553622437. The reversal of 1553622409 is 9042263551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1411655184 + 141967225 = 37572^2 + 11915^2 .

It is a cyclic number.

It is not a de Polignac number, because 1553622409 - 2¹ = 1553622407 is a prime.

Together with 1553622407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1553622407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776811204 + 776811205.

It is an arithmetic number, because the mean of its divisors is an integer number (776811205).

Almost surely, 2^1553622409 is an apocalyptic number.

It is an amenable number.

1553622409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553622409 is an equidigital number, since it uses as much as digits as its factorization.

1553622409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 1553622409 is about 39416.0171630772. The cubic root of 1553622409 is about 1158.1953729774.

The spelling of 1553622409 in words is "one billion, five hundred fifty-three million, six hundred twenty-two thousand, four hundred nine".