2137531231 has 4 divisors (see below), whose sum is σ = 2331852264. Its totient is φ = 1943210200.

The previous prime is 2137531223. The next prime is 2137531267. The reversal of 2137531231 is 1321357312.

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 2137531231 - 2³ = 2137531223 is a prime.

It is a super-2 number, since 2×2137531231² = 9138079527000750722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2137531231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2137531531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97160500 + ... + 97160521.

It is an arithmetic number, because the mean of its divisors is an integer number (582963066).

Almost surely, 2^2137531231 is an apocalyptic number.

2137531231 is a deficient number, since it is larger than the sum of its proper divisors (194321033).

2137531231 is a wasteful number, since it uses less digits than its factorization.

2137531231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194321032.

The product of its digits is 3780, while the sum is 28.

The square root of 2137531231 is about 46233.4427768472. The cubic root of 2137531231 is about 1288.1630065722.

Adding to 2137531231 its reverse (1321357312), we get a palindrome (3458888543).

The spelling of 2137531231 in words is "two billion, one hundred thirty-seven million, five hundred thirty-one thousand, two hundred thirty-one".