2151663 has 8 divisors (see below), whose sum is σ = 2896128. Its totient is φ = 1420824.

The previous prime is 2151659. The next prime is 2151683. The reversal of 2151663 is 3661512.

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

It is not a de Polignac number, because 2151663 - 2² = 2151659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151623) 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, 3031 + ... + 3672.

It is an arithmetic number, because the mean of its divisors is an integer number (362016).

2^2151663 is an apocalyptic number.

2151663 is a deficient number, since it is larger than the sum of its proper divisors (744465).

2151663 is a wasteful number, since it uses less digits than its factorization.

2151663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6813.

The product of its digits is 1080, while the sum is 24.

The square root of 2151663 is about 1466.8547985401. The cubic root of 2151663 is about 129.0995565823.

The spelling of 2151663 in words is "two million, one hundred fifty-one thousand, six hundred sixty-three".