2309481 has 6 divisors (see below), whose sum is σ = 3335930. Its totient is φ = 1539648.

The previous prime is 2309477. The next prime is 2309491. The reversal of 2309481 is 1849032.

It can be written as a sum of positive squares in only one way, i.e., 2277081 + 32400 = 1509^2 + 180^2 .

It is not a de Polignac number, because 2309481 - 2² = 2309477 is a prime.

It is a super-2 number, since 2×2309481² = 10667404978722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2309441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128296 + ... + 128313.

2^2309481 is an apocalyptic number.

It is an amenable number.

2309481 is a deficient number, since it is larger than the sum of its proper divisors (1026449).

2309481 is a wasteful number, since it uses less digits than its factorization.

2309481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256615 (or 256612 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 2309481 is about 1519.6976673010. The cubic root of 2309481 is about 132.1817400203.

The spelling of 2309481 in words is "two million, three hundred nine thousand, four hundred eighty-one".