2151545231 has 4 divisors (see below), whose sum is σ = 2347140264. Its totient is φ = 1955950200.

The previous prime is 2151545203. The next prime is 2151545239. The reversal of 2151545231 is 1325451512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2151545231 - 2⁶ = 2151545167 is a prime.

It is a super-2 number, since 2×2151545231² = 9258293762077686722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2151545194 and 2151545203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151545239) 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 3 ways as a sum of consecutive naturals, for example, 97797500 + ... + 97797521.

It is an arithmetic number, because the mean of its divisors is an integer number (586785066).

Almost surely, 2^2151545231 is an apocalyptic number.

2151545231 is a deficient number, since it is larger than the sum of its proper divisors (195595033).

2151545231 is a wasteful number, since it uses less digits than its factorization.

2151545231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195595032.

The product of its digits is 6000, while the sum is 29.

The square root of 2151545231 is about 46384.7521390381. The cubic root of 2151545231 is about 1290.9720116339.

Adding to 2151545231 its reverse (1325451512), we get a palindrome (3476996743).

The spelling of 2151545231 in words is "two billion, one hundred fifty-one million, five hundred forty-five thousand, two hundred thirty-one".