1641407281 has 2 divisors, whose sum is σ = 1641407282. Its totient is φ = 1641407280.

The previous prime is 1641407269. The next prime is 1641407291. The reversal of 1641407281 is 1827041461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1567447281 + 73960000 = 39591^2 + 8600^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641407281 - 2²¹ = 1639310129 is a prime.

It is a super-2 number, since 2×1641407281² = 5388435724239625922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1641407231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820703640 + 820703641.

It is an arithmetic number, because the mean of its divisors is an integer number (820703641).

Almost surely, 2^1641407281 is an apocalyptic number.

It is an amenable number.

1641407281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641407281 is an equidigital number, since it uses as much as digits as its factorization.

1641407281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 1641407281 is about 40514.2849005138. The cubic root of 1641407281 is about 1179.6109224286.

The spelling of 1641407281 in words is "one billion, six hundred forty-one million, four hundred seven thousand, two hundred eighty-one".