1553136243 has 8 divisors (see below), whose sum is σ = 2078723328. Its totient is φ = 1031486664.

The previous prime is 1553136181. The next prime is 1553136253. The reversal of 1553136243 is 3426313551.

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

It is not a de Polignac number, because 1553136243 - 2¹⁶ = 1553070707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1553136253) 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, 983455 + ... + 985032.

It is an arithmetic number, because the mean of its divisors is an integer number (259840416).

Almost surely, 2^1553136243 is an apocalyptic number.

1553136243 is a deficient number, since it is larger than the sum of its proper divisors (525587085).

1553136243 is a wasteful number, since it uses less digits than its factorization.

1553136243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968753.

The product of its digits is 32400, while the sum is 33.

The square root of 1553136243 is about 39409.8495683503. The cubic root of 1553136243 is about 1158.0745512660.

Adding to 1553136243 its reverse (3426313551), we get a palindrome (4979449794).

The spelling of 1553136243 in words is "one billion, five hundred fifty-three million, one hundred thirty-six thousand, two hundred forty-three".