1231023011 has 4 divisors (see below), whose sum is σ = 1233682272. Its totient is φ = 1228363752.

The previous prime is 1231023007. The next prime is 1231023067. The reversal of 1231023011 is 1103201321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1103201321 = 4933 ⋅223637.

It is a cyclic number.

It is not a de Polignac number, because 1231023011 - 2² = 1231023007 is a prime.

It is a super-2 number, since 2×1231023011² = 3030835307223012242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231023511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1328936 + ... + 1329861.

It is an arithmetic number, because the mean of its divisors is an integer number (308420568).

Almost surely, 2^1231023011 is an apocalyptic number.

1231023011 is a deficient number, since it is larger than the sum of its proper divisors (2659261).

1231023011 is an equidigital number, since it uses as much as digits as its factorization.

1231023011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2659260.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1231023011 is about 35085.9375106324. The cubic root of 1231023011 is about 1071.7382324183.

Adding to 1231023011 its reverse (1103201321), we get a palindrome (2334224332).

The spelling of 1231023011 in words is "one billion, two hundred thirty-one million, twenty-three thousand, eleven".