2151664 has 20 divisors (see below), whose sum is σ = 4218480. Its totient is φ = 1063040.

The previous prime is 2151659. The next prime is 2151683. The reversal of 2151664 is 4661512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 669 + ... + 2179.

It is an arithmetic number, because the mean of its divisors is an integer number (210924).

2^2151664 is an apocalyptic number.

It is an amenable number.

2151664 is a deficient number, since it is larger than the sum of its proper divisors (2066816).

2151664 is a wasteful number, since it uses less digits than its factorization.

2151664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608 (or 1602 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 2151664 is about 1466.8551394054. The cubic root of 2151664 is about 129.0995765823.

The spelling of 2151664 in words is "two million, one hundred fifty-one thousand, six hundred sixty-four".