4151209835981 has 4 divisors (see below), whose sum is σ = 4470533669532. Its totient is φ = 3831886002432.

The previous prime is 4151209835881. The next prime is 4151209836023. The reversal of 4151209835981 is 1895389021514.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1909799622025 + 2241410213956 = 1381955^2 + 1497134^2 .

It is a cyclic number.

It is not a de Polignac number, because 4151209835981 - 2³⁸ = 3876331929037 is a prime.

It is a super-2 number, since 2×4151209835981² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4151209835881) 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, 159661916756 + ... + 159661916781.

It is an arithmetic number, because the mean of its divisors is an integer number (1117633417383).

Almost surely, 2^{4151209835981} is an apocalyptic number.

It is an amenable number.

4151209835981 is a deficient number, since it is larger than the sum of its proper divisors (319323833551).

4151209835981 is a wasteful number, since it uses less digits than its factorization.

4151209835981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319323833550.

The product of its (nonzero) digits is 3110400, while the sum is 56.

The spelling of 4151209835981 in words is "four trillion, one hundred fifty-one billion, two hundred nine million, eight hundred thirty-five thousand, nine hundred eighty-one".