111551101973 has 4 divisors (see below), whose sum is σ = 111558879660. Its totient is φ = 111543324288.

The previous prime is 111551101943. The next prime is 111551101979. The reversal of 111551101973 is 379101155111.

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 98130574564 + 13420527409 = 313258^2 + 115847^2 .

It is a cyclic number.

It is not a de Polignac number, because 111551101973 - 2¹⁰ = 111551100949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111551101979) 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, 3867290 + ... + 3896027.

It is an arithmetic number, because the mean of its divisors is an integer number (27889719915).

Almost surely, 2^111551101973 is an apocalyptic number.

It is an amenable number.

111551101973 is a deficient number, since it is larger than the sum of its proper divisors (7777687).

111551101973 is an equidigital number, since it uses as much as digits as its factorization.

111551101973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7777686.

The product of its (nonzero) digits is 4725, while the sum is 35.

The spelling of 111551101973 in words is "one hundred eleven billion, five hundred fifty-one million, one hundred one thousand, nine hundred seventy-three".