4001387071861 has 2 divisors, whose sum is σ = 4001387071862. Its totient is φ = 4001387071860.

The previous prime is 4001387071837. The next prime is 4001387071883. The reversal of 4001387071861 is 1681707831004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2856285903025 + 1145101168836 = 1690055^2 + 1070094^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4001387071861 is a prime.

It is a super-2 number, since 2×4001387071861² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4001387011861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000693535930 + 2000693535931.

It is an arithmetic number, because the mean of its divisors is an integer number (2000693535931).

Almost surely, 2^{4001387071861} is an apocalyptic number.

It is an amenable number.

4001387071861 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001387071861 is an equidigital number, since it uses as much as digits as its factorization.

4001387071861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 46.

The spelling of 4001387071861 in words is "four trillion, one billion, three hundred eighty-seven million, seventy-one thousand, eight hundred sixty-one".