2661481 has 2 divisors, whose sum is σ = 2661482. Its totient is φ = 2661480.

The previous prime is 2661473. The next prime is 2661487. The reversal of 2661481 is 1841662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2277081 + 384400 = 1509^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661481 - 2³ = 2661473 is a prime.

It is a super-2 number, since 2×2661481² = 14166962226722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2661487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330740 + 1330741.

It is an arithmetic number, because the mean of its divisors is an integer number (1330741).

2^2661481 is an apocalyptic number.

It is an amenable number.

2661481 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661481 is an equidigital number, since it uses as much as digits as its factorization.

2661481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 28.

The square root of 2661481 is about 1631.4046095313. The cubic root of 2661481 is about 138.5823080294.

The spelling of 2661481 in words is "two million, six hundred sixty-one thousand, four hundred eighty-one".