5405681 has 2 divisors, whose sum is σ = 5405682. Its totient is φ = 5405680.

The previous prime is 5405669. The next prime is 5405717. The reversal of 5405681 is 1865045.

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., 3389281 + 2016400 = 1841^2 + 1420^2 .

It is a cyclic number.

It is not a de Polignac number, because 5405681 - 2¹⁴ = 5389297 is a prime.

It is a super-2 number, since 2×5405681² = 58442774147522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (5405641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2702840 + 2702841.

It is an arithmetic number, because the mean of its divisors is an integer number (2702841).

Almost surely, 2^5405681 is an apocalyptic number.

It is an amenable number.

5405681 is a deficient number, since it is larger than the sum of its proper divisors (1).

5405681 is an equidigital number, since it uses as much as digits as its factorization.

5405681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 5405681 is about 2325.0120429796. The cubic root of 5405681 is about 175.5025662295.

The spelling of 5405681 in words is "five million, four hundred five thousand, six hundred eighty-one".