2151863 has 4 divisors (see below), whose sum is σ = 2459280. Its totient is φ = 1844448.

The previous prime is 2151847. The next prime is 2151869. The reversal of 2151863 is 3681512.

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

It is a cyclic number.

It is not a de Polignac number, because 2151863 - 2⁴ = 2151847 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151869) 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, 153698 + ... + 153711.

It is an arithmetic number, because the mean of its divisors is an integer number (614820).

2^2151863 is an apocalyptic number.

2151863 is a deficient number, since it is larger than the sum of its proper divisors (307417).

2151863 is an equidigital number, since it uses as much as digits as its factorization.

2151863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307416.

The product of its digits is 1440, while the sum is 26.

The square root of 2151863 is about 1466.9229700294. The cubic root of 2151863 is about 129.1035564514.

The spelling of 2151863 in words is "two million, one hundred fifty-one thousand, eight hundred sixty-three".