111781355 has 16 divisors (see below), whose sum is σ = 154194624. Its totient is φ = 76202880.

The previous prime is 111781349. The next prime is 111781361. The reversal of 111781355 is 553187111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111781349) and next prime (111781361).

It is not a de Polignac number, because 111781355 - 2⁶ = 111781291 is a prime.

It is a super-4 number, since 4×111781355⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3176 + ... + 15285.

It is an arithmetic number, because the mean of its divisors is an integer number (9637164).

Almost surely, 2^111781355 is an apocalyptic number.

111781355 is a deficient number, since it is larger than the sum of its proper divisors (42413269).

111781355 is a wasteful number, since it uses less digits than its factorization.

111781355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18646.

The product of its digits is 4200, while the sum is 32.

The square root of 111781355 is about 10572.6701925294. The cubic root of 111781355 is about 481.7145785258.

The spelling of 111781355 in words is "one hundred eleven million, seven hundred eighty-one thousand, three hundred fifty-five".