1231245011 has 24 divisors (see below), whose sum is σ = 1349654400. Its totient is φ = 1121869440.

The previous prime is 1231244999. The next prime is 1231245017. The reversal of 1231245011 is 1105421321.

It is not a de Polignac number, because 1231245011 - 2¹⁴ = 1231228627 is a prime.

It is a super-2 number, since 2×1231245011² = 3031928554224780242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231245017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3010175 + ... + 3010583.

It is an arithmetic number, because the mean of its divisors is an integer number (56235600).

Almost surely, 2^1231245011 is an apocalyptic number.

1231245011 is a deficient number, since it is larger than the sum of its proper divisors (118409389).

1231245011 is a wasteful number, since it uses less digits than its factorization.

1231245011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747 (or 728 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1231245011 is about 35089.1010286670. The cubic root of 1231245011 is about 1071.8026535230.

Adding to 1231245011 its reverse (1105421321), we get a palindrome (2336666332).

The spelling of 1231245011 in words is "one billion, two hundred thirty-one million, two hundred forty-five thousand, eleven".