1231967011 has 24 divisors (see below), whose sum is σ = 1426464000. Its totient is φ = 1055015280.

The previous prime is 1231966969. The next prime is 1231967021. The reversal of 1231967011 is 1107691321.

It is not a de Polignac number, because 1231967011 - 2¹⁵ = 1231934243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231967021) 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, 789450 + ... + 791008.

It is an arithmetic number, because the mean of its divisors is an integer number (59436000).

Almost surely, 2^1231967011 is an apocalyptic number.

1231967011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1231967011 is a deficient number, since it is larger than the sum of its proper divisors (194496989).

1231967011 is a wasteful number, since it uses less digits than its factorization.

1231967011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807 (or 1788 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 1231967011 is about 35099.3876157405. The cubic root of 1231967011 is about 1072.0121136760.

The spelling of 1231967011 in words is "one billion, two hundred thirty-one million, nine hundred sixty-seven thousand, eleven".