111961231 has 4 divisors (see below), whose sum is σ = 111984264. Its totient is φ = 111938200.

The previous prime is 111961229. The next prime is 111961237. The reversal of 111961231 is 132169111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111961231 - 2¹ = 111961229 is a prime.

It is a super-2 number, since 2×111961231² = 25070634494070722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111961196 and 111961205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111961237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060 + ... + 15001.

It is an arithmetic number, because the mean of its divisors is an integer number (27996066).

Almost surely, 2^111961231 is an apocalyptic number.

111961231 is a deficient number, since it is larger than the sum of its proper divisors (23033).

111961231 is an equidigital number, since it uses as much as digits as its factorization.

111961231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23032.

The product of its digits is 324, while the sum is 25.

The square root of 111961231 is about 10581.1734226408. The cubic root of 111961231 is about 481.9728280798.

The spelling of 111961231 in words is "one hundred eleven million, nine hundred sixty-one thousand, two hundred thirty-one".