2155403243 has 8 divisors (see below), whose sum is σ = 2467226880. Its totient is φ = 1844556840.

The previous prime is 2155403207. The next prime is 2155403287. The reversal of 2155403243 is 3423045512.

It is a happy number.

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

It is not a de Polignac number, because 2155403243 - 2¹⁴ = 2155386859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155408243) 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 7 ways as a sum of consecutive naturals, for example, 239573 + ... + 248406.

It is an arithmetic number, because the mean of its divisors is an integer number (308403360).

Almost surely, 2^2155403243 is an apocalyptic number.

2155403243 is a deficient number, since it is larger than the sum of its proper divisors (311823637).

2155403243 is an equidigital number, since it uses as much as digits as its factorization.

2155403243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488617.

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 2155403243 is about 46426.3205843409. The cubic root of 2155403243 is about 1291.7431801021.

Adding to 2155403243 its reverse (3423045512), we get a palindrome (5578448755).

The spelling of 2155403243 in words is "two billion, one hundred fifty-five million, four hundred three thousand, two hundred forty-three".