1553145243 has 16 divisors (see below), whose sum is σ = 2231183136. Its totient is φ = 955342080.

The previous prime is 1553145197. The next prime is 1553145247. The reversal of 1553145243 is 3425413551.

It is not a de Polignac number, because 1553145243 - 2⁶ = 1553145179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1553145247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90421 + ... + 106217.

It is an arithmetic number, because the mean of its divisors is an integer number (139448946).

Almost surely, 2^1553145243 is an apocalyptic number.

1553145243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1553145243 is a deficient number, since it is larger than the sum of its proper divisors (678037893).

1553145243 is a wasteful number, since it uses less digits than its factorization.

1553145243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18334.

The product of its digits is 36000, while the sum is 33.

The square root of 1553145243 is about 39409.9637528379. The cubic root of 1553145243 is about 1158.0767881701.

Adding to 1553145243 its reverse (3425413551), we get a palindrome (4978558794).

The spelling of 1553145243 in words is "one billion, five hundred fifty-three million, one hundred forty-five thousand, two hundred forty-three".