2609381 has 6 divisors (see below), whose sum is σ = 2772210. Its totient is φ = 2455616.

The previous prime is 2609377. The next prime is 2609401. The reversal of 2609381 is 1839062.

It can be written as a sum of positive squares in 3 ways, for example, as 1985281 + 624100 = 1409^2 + 790^2 .

It is not a de Polignac number, because 2609381 - 2² = 2609377 is a prime.

It is a super-2 number, since 2×2609381² = 13617738406322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2609311) 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, 4226 + ... + 4803.

It is an arithmetic number, because the mean of its divisors is an integer number (462035).

2^2609381 is an apocalyptic number.

It is an amenable number.

2609381 is a deficient number, since it is larger than the sum of its proper divisors (162829).

2609381 is an equidigital number, since it uses as much as digits as its factorization.

2609381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9063 (or 9046 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 2609381 is about 1615.3578550897. The cubic root of 2609381 is about 137.6720666806.

The spelling of 2609381 in words is "two million, six hundred nine thousand, three hundred eighty-one".