5405921 has 2 divisors, whose sum is σ = 5405922. Its totient is φ = 5405920.

The previous prime is 5405887. The next prime is 5405923. The reversal of 5405921 is 1295045.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4326400 + 1079521 = 2080^2 + 1039^2 .

It is a cyclic number.

It is not a de Polignac number, because 5405921 - 2⁶ = 5405857 is a prime.

Together with 5405923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (5405923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2702960 + 2702961.

It is an arithmetic number, because the mean of its divisors is an integer number (2702961).

Almost surely, 2^5405921 is an apocalyptic number.

It is an amenable number.

5405921 is a deficient number, since it is larger than the sum of its proper divisors (1).

5405921 is an equidigital number, since it uses as much as digits as its factorization.

5405921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 5405921 is about 2325.0636550426. The cubic root of 5405921 is about 175.5051634966.

The spelling of 5405921 in words is "five million, four hundred five thousand, nine hundred twenty-one".