2331220156 has 6 divisors (see below), whose sum is σ = 4079635280. Its totient is φ = 1165610076.

The previous prime is 2331220147. The next prime is 2331220159. The reversal of 2331220156 is 6510221332.

It is a self number, because there is not a number n which added to its sum of digits gives 2331220156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2331220159) 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 as a sum of consecutive naturals, namely, 291402516 + ... + 291402523.

Almost surely, 2^2331220156 is an apocalyptic number.

It is an amenable number.

2331220156 is a deficient number, since it is larger than the sum of its proper divisors (1748415124).

2331220156 is a wasteful number, since it uses less digits than its factorization.

2331220156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582805043 (or 582805041 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 2331220156 is about 48282.7107358317. The cubic root of 2331220156 is about 1325.9518791492.

Adding to 2331220156 its reverse (6510221332), we get a palindrome (8841441488).

The spelling of 2331220156 in words is "two billion, three hundred thirty-one million, two hundred twenty thousand, one hundred fifty-six".