111900001001 has 4 divisors (see below), whose sum is σ = 112124250000. Its totient is φ = 111675752004.

The previous prime is 111900000973. The next prime is 111900001013. The reversal of 111900001001 is 100100009111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 100100009111 = 33767 ⋅2964433.

It is a cyclic number.

It is not a de Polignac number, because 111900001001 - 2⁶ = 111900000937 is a prime.

It is a super-2 number, since 2×111900001001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111900001091) 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, 112123751 + ... + 112124748.

It is an arithmetic number, because the mean of its divisors is an integer number (28031062500).

Almost surely, 2^111900001001 is an apocalyptic number.

It is an amenable number.

111900001001 is a deficient number, since it is larger than the sum of its proper divisors (224248999).

111900001001 is an equidigital number, since it uses as much as digits as its factorization.

111900001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224248998.

The product of its (nonzero) digits is 9, while the sum is 14.

The spelling of 111900001001 in words is "one hundred eleven billion, nine hundred million, one thousand, one".