4051990861 has 8 divisors (see below), whose sum is σ = 4112589600. Its totient is φ = 3991672752.

The previous prime is 4051990841. The next prime is 4051990871. The reversal of 4051990861 is 1680991504.

4051990861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4051990861 - 2²¹ = 4049893709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4051990801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40975 + ... + 98908.

It is an arithmetic number, because the mean of its divisors is an integer number (514073700).

Almost surely, 2^4051990861 is an apocalyptic number.

It is an amenable number.

4051990861 is a deficient number, since it is larger than the sum of its proper divisors (60598739).

4051990861 is a wasteful number, since it uses less digits than its factorization.

4051990861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140315.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 4051990861 is about 63655.2500662750. The cubic root of 4051990861 is about 1594.2489968529.

The spelling of 4051990861 in words is "four billion, fifty-one million, nine hundred ninety thousand, eight hundred sixty-one".