1001212181 has 2 divisors, whose sum is σ = 1001212182. Its totient is φ = 1001212180.

The previous prime is 1001212111. The next prime is 1001212217. The reversal of 1001212181 is 1812121001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 819905956 + 181306225 = 28634^2 + 13465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001212181 is a prime.

It is a super-2 number, since 2×1001212181² = 2004851662765553522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001212111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500606090 + 500606091.

It is an arithmetic number, because the mean of its divisors is an integer number (500606091).

Almost surely, 2^1001212181 is an apocalyptic number.

It is an amenable number.

1001212181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001212181 is an equidigital number, since it uses as much as digits as its factorization.

1001212181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

The square root of 1001212181 is about 31641.9370614379. The cubic root of 1001212181 is about 1000.4038971784.

Adding to 1001212181 its reverse (1812121001), we get a palindrome (2813333182).

The spelling of 1001212181 in words is "one billion, one million, two hundred twelve thousand, one hundred eighty-one".