5213781 has 32 divisors (see below), whose sum is σ = 8426880. Its totient is φ = 3172608.

The previous prime is 5213777. The next prime is 5213821. The reversal of 5213781 is 1873125.

It is not a de Polignac number, because 5213781 - 2² = 5213777 is a prime.

It is a super-2 number, since 2×5213781² = 54367024631922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5213081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16830 + ... + 17136.

It is an arithmetic number, because the mean of its divisors is an integer number (263340).

Almost surely, 2^5213781 is an apocalyptic number.

5213781 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

5213781 is a deficient number, since it is larger than the sum of its proper divisors (3213099).

5213781 is a wasteful number, since it uses less digits than its factorization.

5213781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370 (or 364 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 5213781 is about 2283.3705349767. The cubic root of 5213781 is about 173.4007327468.

The spelling of 5213781 in words is "five million, two hundred thirteen thousand, seven hundred eighty-one".