1001212081 has 2 divisors, whose sum is σ = 1001212082. Its totient is φ = 1001212080.

The previous prime is 1001212067. The next prime is 1001212097. The reversal of 1001212081 is 1802121001.

It is an a-pointer prime, because the next prime (1001212097) can be obtained adding 1001212081 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 751856400 + 249355681 = 27420^2 + 15791^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001212081 - 2¹⁵ = 1001179313 is a prime.

It is a super-2 number, since 2×1001212081² = 2004851262280701122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1001212181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500606040 + 500606041.

It is an arithmetic number, because the mean of its divisors is an integer number (500606041).

Almost surely, 2^1001212081 is an apocalyptic number.

It is an amenable number.

1001212081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001212081 is an equidigital number, since it uses as much as digits as its factorization.

1001212081 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 16.

The square root of 1001212081 is about 31641.9354812565. The cubic root of 1001212081 is about 1000.4038638720.

Adding to 1001212081 its reverse (1802121001), we get a palindrome (2803333082).

The spelling of 1001212081 in words is "one billion, one million, two hundred twelve thousand, eighty-one".