2151955 has 8 divisors (see below), whose sum is σ = 2781072. Its totient is φ = 1589088.

The previous prime is 2151943. The next prime is 2151971. The reversal of 2151955 is 5591512.

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 2151955 - 2⁵ = 2151923 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16489 + ... + 16618.

It is an arithmetic number, because the mean of its divisors is an integer number (347634).

2^2151955 is an apocalyptic number.

2151955 is a deficient number, since it is larger than the sum of its proper divisors (629117).

2151955 is a wasteful number, since it uses less digits than its factorization.

2151955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33125.

The product of its digits is 2250, while the sum is 28.

The square root of 2151955 is about 1466.9543278507. The cubic root of 2151955 is about 129.1053963080.

The spelling of 2151955 in words is "two million, one hundred fifty-one thousand, nine hundred fifty-five".