87744281 has 2 divisors, whose sum is σ = 87744282. Its totient is φ = 87744280.

The previous prime is 87744277. The next prime is 87744301. The reversal of 87744281 is 18244778.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87254281 + 490000 = 9341^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 87744281 - 2² = 87744277 is a prime.

It is a super-2 number, since 2×87744281² = 15398117696413922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (87744211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43872140 + 43872141.

It is an arithmetic number, because the mean of its divisors is an integer number (43872141).

Almost surely, 2^87744281 is an apocalyptic number.

It is an amenable number.

87744281 is a deficient number, since it is larger than the sum of its proper divisors (1).

87744281 is an equidigital number, since it uses as much as digits as its factorization.

87744281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100352, while the sum is 41.

The square root of 87744281 is about 9367.1917349865. The cubic root of 87744281 is about 444.3647561967.

The spelling of 87744281 in words is "eighty-seven million, seven hundred forty-four thousand, two hundred eighty-one".