1231967013 has 4 divisors (see below), whose sum is σ = 1642622688. Its totient is φ = 821311340.

The previous prime is 1231966969. The next prime is 1231967021. The reversal of 1231967013 is 3107691321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1231967013 - 2⁶ = 1231966949 is a prime.

It is a super-2 number, since 2×1231967013² = 3035485442240284338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231967083) 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, 205327833 + ... + 205327838.

It is an arithmetic number, because the mean of its divisors is an integer number (410655672).

Almost surely, 2^1231967013 is an apocalyptic number.

It is an amenable number.

1231967013 is a deficient number, since it is larger than the sum of its proper divisors (410655675).

1231967013 is an equidigital number, since it uses as much as digits as its factorization.

1231967013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410655674.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 1231967013 is about 35099.3876442311. The cubic root of 1231967013 is about 1072.0121142562.

It can be divided in two parts, 123 and 1967013, that added together give a triangular number (1967136 = T₁₉₈₃).

The spelling of 1231967013 in words is "one billion, two hundred thirty-one million, nine hundred sixty-seven thousand, thirteen".