1553144861 has 8 divisors (see below), whose sum is σ = 1577059584. Its totient is φ = 1529301600.

The previous prime is 1553144843. The next prime is 1553144863. The reversal of 1553144861 is 1684413551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1553144861 - 2¹⁴ = 1553128477 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 (1553144863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26786 + ... + 61836.

It is an arithmetic number, because the mean of its divisors is an integer number (197132448).

Almost surely, 2^1553144861 is an apocalyptic number.

It is an amenable number.

1553144861 is a deficient number, since it is larger than the sum of its proper divisors (23914723).

1553144861 is an equidigital number, since it uses as much as digits as its factorization.

1553144861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35731.

The product of its digits is 57600, while the sum is 38.

The square root of 1553144861 is about 39409.9589063475. The cubic root of 1553144861 is about 1158.0766932262.

The spelling of 1553144861 in words is "one billion, five hundred fifty-three million, one hundred forty-four thousand, eight hundred sixty-one".