1555313243 has 4 divisors (see below), whose sum is σ = 1696705368. Its totient is φ = 1413921120.

The previous prime is 1555313233. The next prime is 1555313281. The reversal of 1555313243 is 3423135551.

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

It is a cyclic number.

It is not a de Polignac number, because 1555313243 - 2⁸ = 1555312987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1555313203) 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, 70696046 + ... + 70696067.

It is an arithmetic number, because the mean of its divisors is an integer number (424176342).

Almost surely, 2^1555313243 is an apocalyptic number.

1555313243 is a deficient number, since it is larger than the sum of its proper divisors (141392125).

1555313243 is a wasteful number, since it uses less digits than its factorization.

1555313243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141392124.

The product of its digits is 27000, while the sum is 32.

The square root of 1555313243 is about 39437.4598953837. The cubic root of 1555313243 is about 1158.6153819642.

Adding to 1555313243 its reverse (3423135551), we get a palindrome (4978448794).

The spelling of 1555313243 in words is "one billion, five hundred fifty-five million, three hundred thirteen thousand, two hundred forty-three".