1201100081 has 2 divisors, whose sum is σ = 1201100082. Its totient is φ = 1201100080.

The previous prime is 1201100071. The next prime is 1201100101. The reversal of 1201100081 is 1800011021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1153213681 + 47886400 = 33959^2 + 6920^2 .

It is an emirp because it is prime and its reverse (1800011021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201100081 - 2²⁶ = 1133991217 is a prime.

It is a super-2 number, since 2×1201100081² = 2885282809156413122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1201100041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600550040 + 600550041.

It is an arithmetic number, because the mean of its divisors is an integer number (600550041).

Almost surely, 2^1201100081 is an apocalyptic number.

It is an amenable number.

1201100081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201100081 is an equidigital number, since it uses as much as digits as its factorization.

1201100081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 1201100081 is about 34656.8908155362. The cubic root of 1201100081 is about 1062.9831951435.

The spelling of 1201100081 in words is "one billion, two hundred one million, one hundred thousand, eighty-one".