2131305 has 16 divisors (see below), whose sum is σ = 3720384. Its totient is φ = 1033280.

The previous prime is 2131291. The next prime is 2131319. The reversal of 2131305 is 5031312.

2131305 = T₂₈₅ + T₂₈₆ + ... + T₃₂₉.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2131291) and next prime (2131319).

It is not a de Polignac number, because 2131305 - 2⁸ = 2131049 is a prime.

It is a super-2 number, since 2×2131305² = 9084922006050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6294 + ... + 6623.

It is an arithmetic number, because the mean of its divisors is an integer number (232524).

2^2131305 is an apocalyptic number.

It is an amenable number.

2131305 is a deficient number, since it is larger than the sum of its proper divisors (1589079).

2131305 is a wasteful number, since it uses less digits than its factorization.

2131305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12936.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 2131305 is about 1459.8989691071. The cubic root of 2131305 is about 128.6911063791.

Adding to 2131305 its reverse (5031312), we get a palindrome (7162617).

The spelling of 2131305 in words is "two million, one hundred thirty-one thousand, three hundred five".