30981755 has 16 divisors (see below), whose sum is σ = 42677184. Its totient is φ = 21150720.

The previous prime is 30981749. The next prime is 30981757. The reversal of 30981755 is 55718903.

It is not a de Polignac number, because 30981755 - 2¹⁶ = 30916219 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30981757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6599 + ... + 10271.

It is an arithmetic number, because the mean of its divisors is an integer number (2667324).

Almost surely, 2^30981755 is an apocalyptic number.

30981755 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

30981755 is a deficient number, since it is larger than the sum of its proper divisors (11695429).

30981755 is a wasteful number, since it uses less digits than its factorization.

30981755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3926.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 30981755 is about 5566.1256723146. The cubic root of 30981755 is about 314.0764246609.

The spelling of 30981755 in words is "thirty million, nine hundred eighty-one thousand, seven hundred fifty-five".