111020311997 has 20 divisors (see below), whose sum is σ = 133694015616. Its totient is φ = 92090519640.

The previous prime is 111020311991. The next prime is 111020312041. The reversal of 111020311997 is 799113020111.

It is not a de Polignac number, because 111020311997 - 2¹⁴ = 111020295613 is a prime.

It is a super-2 number, since 2×111020311997² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111020311991) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 671363 + ... + 820224.

Almost surely, 2^111020311997 is an apocalyptic number.

It is an amenable number.

111020311997 is a deficient number, since it is larger than the sum of its proper divisors (22673703619).

111020311997 is an frugal number, since it uses more digits than its factorization.

111020311997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491646 (or 1491625 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 35.

The spelling of 111020311997 in words is "one hundred eleven billion, twenty million, three hundred eleven thousand, nine hundred ninety-seven".