231121602 has 12 divisors (see below), whose sum is σ = 500763510. Its totient is φ = 77040528.

The previous prime is 231121591. The next prime is 231121621. The reversal of 231121602 is 206121132.

It can be written as a sum of positive squares in only one way, i.e., 230159241 + 962361 = 15171^2 + 981^2 .

It is a super-2 number, since 2×231121602² = 106834389822092808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 12840089 = 231121602 / (2 + 3 + 1 + 1 + 2 + 1 + 6 + 0 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6420027 + ... + 6420062.

Almost surely, 2^231121602 is an apocalyptic number.

231121602 is an abundant number, since it is smaller than the sum of its proper divisors (269641908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231121602 is a wasteful number, since it uses less digits than its factorization.

231121602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12840097 (or 12840094 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 231121602 is about 15202.6840393399. The cubic root of 231121602 is about 613.6868909715.

Adding to 231121602 its reverse (206121132), we get a palindrome (437242734).

The spelling of 231121602 in words is "two hundred thirty-one million, one hundred twenty-one thousand, six hundred two".