5921781 has 4 divisors (see below), whose sum is σ = 7895712. Its totient is φ = 3947852.

The previous prime is 5921759. The next prime is 5921789. The reversal of 5921781 is 1871295.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5921781 - 2⁶ = 5921717 is a prime.

It is a super-2 number, since 2×5921781² = 70134980423922, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5921789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 986961 + ... + 986966.

It is an arithmetic number, because the mean of its divisors is an integer number (1973928).

Almost surely, 2^5921781 is an apocalyptic number.

It is an amenable number.

5921781 is a deficient number, since it is larger than the sum of its proper divisors (1973931).

5921781 is a wasteful number, since it uses less digits than its factorization.

5921781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973930.

The product of its digits is 5040, while the sum is 33.

The square root of 5921781 is about 2433.4709778421. The cubic root of 5921781 is about 180.9189731240.

The spelling of 5921781 in words is "five million, nine hundred twenty-one thousand, seven hundred eighty-one".