1031231121 has 8 divisors (see below), whose sum is σ = 1379056224. Its totient is φ = 685446720.

The previous prime is 1031231119. The next prime is 1031231141. The reversal of 1031231121 is 1211321301.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1031231121 - 2¹ = 1031231119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1031231121.

It is not an unprimeable number, because it can be changed into a prime (1031231141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508995 + ... + 511016.

It is an arithmetic number, because the mean of its divisors is an integer number (172382028).

Almost surely, 2^1031231121 is an apocalyptic number.

It is an amenable number.

1031231121 is a deficient number, since it is larger than the sum of its proper divisors (347825103).

1031231121 is a wasteful number, since it uses less digits than its factorization.

1031231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020351.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1031231121 is about 32112.7874996862. The cubic root of 1031231121 is about 1010.3038399001.

Adding to 1031231121 its reverse (1211321301), we get a palindrome (2242552422).

The spelling of 1031231121 in words is "one billion, thirty-one million, two hundred thirty-one thousand, one hundred twenty-one".