1213012319 has 4 divisors (see below), whose sum is σ = 1254840360. Its totient is φ = 1171184280.

The previous prime is 1213012303. The next prime is 1213012363. The reversal of 1213012319 is 9132103121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9132103121 = 97 ⋅94145393.

It is a cyclic number.

It is not a de Polignac number, because 1213012319 - 2⁴ = 1213012303 is a prime.

It is a super-2 number, since 2×1213012319² = 2942797772091515522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213012294 and 1213012303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213012379) 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, 20913977 + ... + 20914034.

It is an arithmetic number, because the mean of its divisors is an integer number (313710090).

Almost surely, 2^1213012319 is an apocalyptic number.

1213012319 is a deficient number, since it is larger than the sum of its proper divisors (41828041).

1213012319 is an equidigital number, since it uses as much as digits as its factorization.

1213012319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41828040.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1213012319 is about 34828.3263881571. The cubic root of 1213012319 is about 1066.4857832710.

The spelling of 1213012319 in words is "one billion, two hundred thirteen million, twelve thousand, three hundred nineteen".