4001026681 has 4 divisors (see below), whose sum is σ = 4003888000. Its totient is φ = 3998165364.

The previous prime is 4001026613. The next prime is 4001026691. The reversal of 4001026681 is 1866201004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4001026681 - 2¹⁹ = 4000502393 is a prime.

It is a super-2 number, since 2×4001026681² = 32016429004147751522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4001026691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1428561 + ... + 1431358.

It is an arithmetic number, because the mean of its divisors is an integer number (1000972000).

Almost surely, 2^4001026681 is an apocalyptic number.

It is an amenable number.

4001026681 is a deficient number, since it is larger than the sum of its proper divisors (2861319).

4001026681 is a wasteful number, since it uses less digits than its factorization.

4001026681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2861318.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 4001026681 is about 63253.6693085864. The cubic root of 4001026681 is about 1587.5368532251.

Adding to 4001026681 its reverse (1866201004), we get a palindrome (5867227685).

The spelling of 4001026681 in words is "four billion, one million, twenty-six thousand, six hundred eighty-one".