1913191368 has 64 divisors (see below), whose sum is σ = 5234483520. Its totient is φ = 577900800.

The previous prime is 1913191367. The next prime is 1913191387. The reversal of 1913191368 is 8631913191.

It is a super-2 number, since 2×1913191368² = 7320602421179422848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1913191367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72258 + ... + 95118.

It is an arithmetic number, because the mean of its divisors is an integer number (81788805).

Almost surely, 2^1913191368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1913191368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2617241760).

1913191368 is an abundant number, since it is smaller than the sum of its proper divisors (3321292152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1913191368 is a wasteful number, since it uses less digits than its factorization.

1913191368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23198 (or 23194 counting only the distinct ones).

The product of its digits is 34992, while the sum is 42.

The square root of 1913191368 is about 43740.0430726811. The cubic root of 1913191368 is about 1241.4220954651.

The spelling of 1913191368 in words is "one billion, nine hundred thirteen million, one hundred ninety-one thousand, three hundred sixty-eight".