111751961 has 4 divisors (see below), whose sum is σ = 111775524. Its totient is φ = 111728400.

The previous prime is 111751957. The next prime is 111751967. The reversal of 111751961 is 169157111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 76230361 + 35521600 = 8731^2 + 5960^2 .

It is a cyclic number.

It is not a de Polignac number, because 111751961 - 2² = 111751957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111751967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1910 + ... + 15071.

It is an arithmetic number, because the mean of its divisors is an integer number (27943881).

Almost surely, 2^111751961 is an apocalyptic number.

It is an amenable number.

111751961 is a deficient number, since it is larger than the sum of its proper divisors (23563).

111751961 is an equidigital number, since it uses as much as digits as its factorization.

111751961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23562.

The product of its digits is 1890, while the sum is 32.

The square root of 111751961 is about 10571.2800076434. The cubic root of 111751961 is about 481.6723509717.

The spelling of 111751961 in words is "one hundred eleven million, seven hundred fifty-one thousand, nine hundred sixty-one".