2143156401 has 20 divisors (see below), whose sum is σ = 3237488100. Its totient is φ = 1412712576.

The previous prime is 2143156397. The next prime is 2143156409. The reversal of 2143156401 is 1046513412.

It is a happy number.

2143156401 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 15 + 640 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 617472801 + 1525683600 = 24849^2 + 39060^2 .

It is not a de Polignac number, because 2143156401 - 2² = 2143156397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2143156409) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 141436 + ... + 155853.

It is an arithmetic number, because the mean of its divisors is an integer number (161874405).

Almost surely, 2^2143156401 is an apocalyptic number.

It is an amenable number.

2143156401 is a deficient number, since it is larger than the sum of its proper divisors (1094331699).

2143156401 is an equidigital number, since it uses as much as digits as its factorization.

2143156401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297390 (or 297381 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 2143156401 is about 46294.2372331589. The cubic root of 2143156401 is about 1289.2920019779.

Adding to 2143156401 its reverse (1046513412), we get a palindrome (3189669813).

The spelling of 2143156401 in words is "two billion, one hundred forty-three million, one hundred fifty-six thousand, four hundred one".