2861901989 has 8 divisors (see below), whose sum is σ = 2955422208. Its totient is φ = 2768456880.

The previous prime is 2861901949. The next prime is 2861902013. The reversal of 2861901989 is 9891091682.

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 2861901989 - 2²⁴ = 2845124773 is a prime.

It is a super-2 number, since 2×2861901989² = 16380965989284312242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2861901989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2861901919) 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, 64619 + ... + 99495.

It is an arithmetic number, because the mean of its divisors is an integer number (369427776).

Almost surely, 2^2861901989 is an apocalyptic number.

It is an amenable number.

2861901989 is a deficient number, since it is larger than the sum of its proper divisors (93520219).

2861901989 is a wasteful number, since it uses less digits than its factorization.

2861901989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37555.

The product of its (nonzero) digits is 559872, while the sum is 53.

The square root of 2861901989 is about 53496.7474618785. The cubic root of 2861901989 is about 1419.7708399956.

The spelling of 2861901989 in words is "two billion, eight hundred sixty-one million, nine hundred one thousand, nine hundred eighty-nine".