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5215981 = 9753773
BaseRepresentation
bin10011111001011011101101
3100210222222111
4103321123231
52313402411
6303444021
762222641
oct23713355
910728874
105215981
112a42931
1218b6611
1311081a4
1499ac21
156d0721
hex4f96ed

5215981 has 4 divisors (see below), whose sum is σ = 5269852. Its totient is φ = 5162112.

The previous prime is 5215961. The next prime is 5215997. The reversal of 5215981 is 1895125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2992900 + 2223081 = 1730^2 + 1491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-5215981 is a prime.

It is a super-2 number, since 2×52159812 = 54412915584722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5215901) 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, 26790 + ... + 26983.

It is an arithmetic number, because the mean of its divisors is an integer number (1317463).

Almost surely, 25215981 is an apocalyptic number.

It is an amenable number.

5215981 is a deficient number, since it is larger than the sum of its proper divisors (53871).

5215981 is an equidigital number, since it uses as much as digits as its factorization.

5215981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53870.

The product of its digits is 3600, while the sum is 31.

The square root of 5215981 is about 2283.8522281444. The cubic root of 5215981 is about 173.4251186302.

The spelling of 5215981 in words is "five million, two hundred fifteen thousand, nine hundred eighty-one".

Divisors: 1 97 53773 5215981