2155543401 has 16 divisors (see below), whose sum is σ = 3136186368. Its totient is φ = 1306035600.

The previous prime is 2155543399. The next prime is 2155543427. The reversal of 2155543401 is 1043455512.

It is not a de Polignac number, because 2155543401 - 2¹ = 2155543399 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2155543451) 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, 166380 + ... + 178866.

It is an arithmetic number, because the mean of its divisors is an integer number (196011648).

Almost surely, 2^2155543401 is an apocalyptic number.

It is an amenable number.

2155543401 is a deficient number, since it is larger than the sum of its proper divisors (980642967).

2155543401 is a wasteful number, since it uses less digits than its factorization.

2155543401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17732.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 2155543401 is about 46427.8300268277. The cubic root of 2155543401 is about 1291.7711786088.

Adding to 2155543401 its reverse (1043455512), we get a palindrome (3198998913).

The spelling of 2155543401 in words is "two billion, one hundred fifty-five million, five hundred forty-three thousand, four hundred one".