2151305 has 16 divisors (see below), whose sum is σ = 2903040. Its totient is φ = 1518528.

The previous prime is 2151301. The next prime is 2151319. The reversal of 2151305 is 5031512.

It is a cyclic number.

It is not a de Polignac number, because 2151305 - 2² = 2151301 is a prime.

It is a super-2 number, since 2×2151305² = 9256226406050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2151301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 776 + ... + 2214.

It is an arithmetic number, because the mean of its divisors is an integer number (181440).

2^2151305 is an apocalyptic number.

It is an amenable number.

2151305 is a deficient number, since it is larger than the sum of its proper divisors (751735).

2151305 is a wasteful number, since it uses less digits than its factorization.

2151305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 2151305 is about 1466.7327636621. The cubic root of 2151305 is about 129.0923961975.

Adding to 2151305 its reverse (5031512), we get a palindrome (7182817).

The spelling of 2151305 in words is "two million, one hundred fifty-one thousand, three hundred five".