1011231231 has 8 divisors (see below), whose sum is σ = 1351423920. Its totient is φ = 672596352.

The previous prime is 1011231223. The next prime is 1011231239. The reversal of 1011231231 is 1321321101.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1011231223) and next prime (1011231239).

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

It is not a de Polignac number, because 1011231231 - 2³ = 1011231223 is a prime.

It is a super-2 number, since 2×1011231231² = 2045177205099550722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1011231231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011231239) 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, 387936 + ... + 390533.

It is an arithmetic number, because the mean of its divisors is an integer number (168927990).

Almost surely, 2^1011231231 is an apocalyptic number.

1011231231 is a deficient number, since it is larger than the sum of its proper divisors (340192689).

1011231231 is an equidigital number, since it uses as much as digits as its factorization.

1011231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778905.

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

The square root of 1011231231 is about 31799.8621223426. The cubic root of 1011231231 is about 1003.7298148520.

Adding to 1011231231 its reverse (1321321101), we get a palindrome (2332552332).

The spelling of 1011231231 in words is "one billion, eleven million, two hundred thirty-one thousand, two hundred thirty-one".