1210111997 has 2 divisors, whose sum is σ = 1210111998. Its totient is φ = 1210111996.

The previous prime is 1210111951. The next prime is 1210112009. The reversal of 1210111997 is 7991110121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1034973241 + 175138756 = 32171^2 + 13234^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210111997 - 2⁶ = 1210111933 is a prime.

It is a super-3 number, since 3×1210111997³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210111927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605055998 + 605055999.

It is an arithmetic number, because the mean of its divisors is an integer number (605055999).

Almost surely, 2^1210111997 is an apocalyptic number.

It is an amenable number.

1210111997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210111997 is an equidigital number, since it uses as much as digits as its factorization.

1210111997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 32.

The square root of 1210111997 is about 34786.6640682892. The cubic root of 1210111997 is about 1065.6351129572.

The spelling of 1210111997 in words is "one billion, two hundred ten million, one hundred eleven thousand, nine hundred ninety-seven".