2171000837 has 8 divisors (see below), whose sum is σ = 2191823640. Its totient is φ = 2150277120.

The previous prime is 2171000791. The next prime is 2171000879. The reversal of 2171000837 is 7380001712.

It is a Cunningham number, because it is equal to 46594²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 132388036 + 2038612801 = 11506^2 + 45151^2 .

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 2171000837 - 2¹² = 2170996741 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 (2171006837) 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, 19637 + ... + 68757.

It is an arithmetic number, because the mean of its divisors is an integer number (273977955).

Almost surely, 2^2171000837 is an apocalyptic number.

It is an amenable number.

2171000837 is a deficient number, since it is larger than the sum of its proper divisors (20822803).

2171000837 is a wasteful number, since it uses less digits than its factorization.

2171000837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49543.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 2171000837 is about 46594.0000107310. Note that the first 4 decimals coincide. The cubic root of 2171000837 is about 1294.8515976094.

The spelling of 2171000837 in words is "two billion, one hundred seventy-one million, eight hundred thirty-seven", and thus it is an aban number.