5391681 has 4 divisors (see below), whose sum is σ = 7188912. Its totient is φ = 3594452.

The previous prime is 5391679. The next prime is 5391689. The reversal of 5391681 is 1861935.

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 5391681 - 2¹ = 5391679 is a prime.

It is a super-2 number, since 2×5391681² = 58140448011522, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (5391689) 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, 898611 + ... + 898616.

It is an arithmetic number, because the mean of its divisors is an integer number (1797228).

Almost surely, 2^5391681 is an apocalyptic number.

It is an amenable number.

5391681 is a deficient number, since it is larger than the sum of its proper divisors (1797231).

5391681 is a wasteful number, since it uses less digits than its factorization.

5391681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1797230.

The product of its digits is 6480, while the sum is 33.

The square root of 5391681 is about 2321.9993540051. Note that the first 3 decimals coincide. The cubic root of 5391681 is about 175.3509257537.

The spelling of 5391681 in words is "five million, three hundred ninety-one thousand, six hundred eighty-one".