231622137 has 24 divisors (see below), whose sum is σ = 342303624. Its totient is φ = 150868224.

The previous prime is 231622099. The next prime is 231622163. The reversal of 231622137 is 731226132.

231622137 is a `hidden beast` number, since 2 + 3 + 1 + 622 + 1 + 37 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 95481 + 231526656 = 309^2 + 15216^2 .

It is not a de Polignac number, because 231622137 - 2¹⁰ = 231621113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231622137.

It is not an unprimeable number, because it can be changed into a prime (231622187) 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 23 ways as a sum of consecutive naturals, for example, 131253 + ... + 133005.

It is an arithmetic number, because the mean of its divisors is an integer number (14262651).

Almost surely, 2^231622137 is an apocalyptic number.

It is an amenable number.

231622137 is a deficient number, since it is larger than the sum of its proper divisors (110681487).

231622137 is a wasteful number, since it uses less digits than its factorization.

231622137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2089 (or 2086 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 231622137 is about 15219.1371963065. The cubic root of 231622137 is about 614.1295876395.

Adding to 231622137 its reverse (731226132), we get a palindrome (962848269).

The spelling of 231622137 in words is "two hundred thirty-one million, six hundred twenty-two thousand, one hundred thirty-seven".