2190481 has 2 divisors, whose sum is σ = 2190482. Its totient is φ = 2190480.

The previous prime is 2190479. The next prime is 2190499. The reversal of 2190481 is 1840912.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2190400 + 81 = 1480^2 + 9^2 .

It is a cyclic number.

It is not a de Polignac number, because 2190481 - 2¹ = 2190479 is a prime.

It is a super-2 number, since 2×2190481² = 9596414022722, which contains 22 as substring.

Together with 2190479, it forms a pair of twin primes.

2190481 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2190581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095240 + 1095241.

It is an arithmetic number, because the mean of its divisors is an integer number (1095241).

2^2190481 is an apocalyptic number.

It is an amenable number.

2190481 is a deficient number, since it is larger than the sum of its proper divisors (1).

2190481 is an equidigital number, since it uses as much as digits as its factorization.

2190481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 2190481 is about 1480.0273646119. The cubic root of 2190481 is about 129.8712927330.

It can be divided in two parts, 21904 and 81, that multiplied together give a square (1774224 = 1332²).

The spelling of 2190481 in words is "two million, one hundred ninety thousand, four hundred eighty-one".