1912981213 has 8 divisors (see below), whose sum is σ = 2247418656. Its totient is φ = 1605298800.

The previous prime is 1912981183. The next prime is 1912981241. The reversal of 1912981213 is 3121892191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1912981213 - 2⁹ = 1912980701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1912981243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6688603 + ... + 6688888.

It is an arithmetic number, because the mean of its divisors is an integer number (280927332).

Almost surely, 2^1912981213 is an apocalyptic number.

1912981213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1912981213 is a deficient number, since it is larger than the sum of its proper divisors (334437443).

1912981213 is a wasteful number, since it uses less digits than its factorization.

1912981213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13377515.

The product of its digits is 7776, while the sum is 37.

The square root of 1912981213 is about 43737.6406885419. The cubic root of 1912981213 is about 1241.3766390238.

The spelling of 1912981213 in words is "one billion, nine hundred twelve million, nine hundred eighty-one thousand, two hundred thirteen".