1613706381 has 64 divisors (see below), whose sum is σ = 2886819840. Its totient is φ = 881833392.

The previous prime is 1613706379. The next prime is 1613706403. The reversal of 1613706381 is 1836073161.

1613706381 is a `hidden beast` number, since 1 + 6 + 13 + 7 + 0 + 638 + 1 = 666.

It is not a de Polignac number, because 1613706381 - 2¹ = 1613706379 is a prime.

It is a super-3 number, since 3×1613706381³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613706371) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 349816 + ... + 354398.

It is an arithmetic number, because the mean of its divisors is an integer number (45106560).

Almost surely, 2^1613706381 is an apocalyptic number.

It is an amenable number.

1613706381 is a deficient number, since it is larger than the sum of its proper divisors (1273113459).

1613706381 is an frugal number, since it uses more digits than its factorization.

1613706381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4634 (or 4616 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1613706381 is about 40170.9644021649. The cubic root of 1613706381 is about 1172.9374120359.

The spelling of 1613706381 in words is "one billion, six hundred thirteen million, seven hundred six thousand, three hundred eighty-one".