2906581 has 2 divisors, whose sum is σ = 2906582. Its totient is φ = 2906580.

The previous prime is 2906569. The next prime is 2906593. The reversal of 2906581 is 1856092.

It is a balanced prime because it is at equal distance from previous prime (2906569) and next prime (2906593).

It can be written as a sum of positive squares in only one way, i.e., 2430481 + 476100 = 1559^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 2906581 - 2⁵ = 2906549 is a prime.

It is a super-2 number, since 2×2906581² = 16896426219122, which contains 22 as substring.

2906581 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2906521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1453290 + 1453291.

It is an arithmetic number, because the mean of its divisors is an integer number (1453291).

2^2906581 is an apocalyptic number.

It is an amenable number.

2906581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2906581 is an equidigital number, since it uses as much as digits as its factorization.

2906581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2906581 is about 1704.8697897494. The cubic root of 2906581 is about 142.7121043681.

The spelling of 2906581 in words is "two million, nine hundred six thousand, five hundred eighty-one".