1213620319 has 4 divisors (see below), whose sum is σ = 1213712280. Its totient is φ = 1213528360.

The previous prime is 1213620311. The next prime is 1213620337. The reversal of 1213620319 is 9130263121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9130263121 = 7 ⋅1304323303.

It is a cyclic number.

It is not a de Polignac number, because 1213620319 - 2³ = 1213620311 is a prime.

It is a super-2 number, since 2×1213620319² = 2945748557379323522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213620311) 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, 22024 + ... + 53965.

It is an arithmetic number, because the mean of its divisors is an integer number (303428070).

Almost surely, 2^1213620319 is an apocalyptic number.

1213620319 is a deficient number, since it is larger than the sum of its proper divisors (91961).

1213620319 is an equidigital number, since it uses as much as digits as its factorization.

1213620319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91960.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1213620319 is about 34837.0538220441. The cubic root of 1213620319 is about 1066.6639389362.

The spelling of 1213620319 in words is "one billion, two hundred thirteen million, six hundred twenty thousand, three hundred nineteen".