4012126991 has 2 divisors, whose sum is σ = 4012126992. Its totient is φ = 4012126990.

The previous prime is 4012126903. The next prime is 4012127011. The reversal of 4012126991 is 1996212104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4012126991 - 2¹⁸ = 4011864847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4012126691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2006063495 + 2006063496.

It is an arithmetic number, because the mean of its divisors is an integer number (2006063496).

Almost surely, 2^4012126991 is an apocalyptic number.

4012126991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4012126991 is an equidigital number, since it uses as much as digits as its factorization.

4012126991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 4012126991 is about 63341.3529299777. The cubic root of 4012126991 is about 1589.0036333727.

The spelling of 4012126991 in words is "four billion, twelve million, one hundred twenty-six thousand, nine hundred ninety-one".