1913129381 has 8 divisors (see below), whose sum is σ = 1987926528. Its totient is φ = 1839150000.

The previous prime is 1913129369. The next prime is 1913129401. The reversal of 1913129381 is 1839213191.

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 1913129381 - 2³⁰ = 839387557 is a prime.

It is a super-2 number, since 2×1913129381² = 7320128056890886322, 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 (1913129321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199670 + ... + 209031.

It is an arithmetic number, because the mean of its divisors is an integer number (248490816).

Almost surely, 2^1913129381 is an apocalyptic number.

It is an amenable number.

1913129381 is a deficient number, since it is larger than the sum of its proper divisors (74797147).

1913129381 is a wasteful number, since it uses less digits than its factorization.

1913129381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408883.

The product of its digits is 11664, while the sum is 38.

The square root of 1913129381 is about 43739.3344828199. The cubic root of 1913129381 is about 1241.4086880483.

The spelling of 1913129381 in words is "one billion, nine hundred thirteen million, one hundred twenty-nine thousand, three hundred eighty-one".