1553655361 has 4 divisors (see below), whose sum is σ = 1553857732. Its totient is φ = 1553452992.

The previous prime is 1553655343. The next prime is 1553655379. The reversal of 1553655361 is 1635563551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1553655343) and next prime (1553655379).

It can be written as a sum of positive squares in 2 ways, for example, as 55965361 + 1497690000 = 7481^2 + 38700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1553655361 - 2⁵ = 1553655329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1553655331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89196 + ... + 105181.

It is an arithmetic number, because the mean of its divisors is an integer number (388464433).

Almost surely, 2^1553655361 is an apocalyptic number.

It is an amenable number.

1553655361 is a deficient number, since it is larger than the sum of its proper divisors (202371).

1553655361 is an equidigital number, since it uses as much as digits as its factorization.

1553655361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202370.

The product of its digits is 202500, while the sum is 40.

The square root of 1553655361 is about 39416.4351635203. The cubic root of 1553655361 is about 1158.2035612785.

The spelling of 1553655361 in words is "one billion, five hundred fifty-three million, six hundred fifty-five thousand, three hundred sixty-one".