1013155243 has 4 divisors (see below), whose sum is σ = 1013251248. Its totient is φ = 1013059240.

The previous prime is 1013155229. The next prime is 1013155249. The reversal of 1013155243 is 3425513101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3425513101 = 73 ⋅46924837.

It is a cyclic number.

It is not a de Polignac number, because 1013155243 - 2²¹ = 1011058091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1013155249) 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, 29896 + ... + 54037.

It is an arithmetic number, because the mean of its divisors is an integer number (253312812).

Almost surely, 2^1013155243 is an apocalyptic number.

1013155243 is a deficient number, since it is larger than the sum of its proper divisors (96005).

1013155243 is an equidigital number, since it uses as much as digits as its factorization.

1013155243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96004.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1013155243 is about 31830.0996385497. The cubic root of 1013155243 is about 1004.3659913780.

Adding to 1013155243 its reverse (3425513101), we get a palindrome (4438668344).

The spelling of 1013155243 in words is "one billion, thirteen million, one hundred fifty-five thousand, two hundred forty-three".