1011001231 has 4 divisors (see below), whose sum is σ = 1012816872. Its totient is φ = 1009185592.

The previous prime is 1011001217. The next prime is 1011001279. The reversal of 1011001231 is 1321001101.

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 1011001231 - 2¹⁵ = 1010968463 is a prime.

It is a super-2 number, since 2×1011001231² = 2044246978167030722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011001291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 906985 + ... + 908098.

It is an arithmetic number, because the mean of its divisors is an integer number (253204218).

Almost surely, 2^1011001231 is an apocalyptic number.

1011001231 is a deficient number, since it is larger than the sum of its proper divisors (1815641).

1011001231 is an equidigital number, since it uses as much as digits as its factorization.

1011001231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1815640.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 1011001231 is about 31796.2455488065. The cubic root of 1011001231 is about 1003.6537111364.

Adding to 1011001231 its reverse (1321001101), we get a palindrome (2332002332).

The spelling of 1011001231 in words is "one billion, eleven million, one thousand, two hundred thirty-one".