7987481 has 2 divisors, whose sum is σ = 7987482. Its totient is φ = 7987480.

The previous prime is 7987477. The next prime is 7987487. The reversal of 7987481 is 1847897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7728400 + 259081 = 2780^2 + 509^2 .

It is an emirp because it is prime and its reverse (1847897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7987481 - 2² = 7987477 is a prime.

It is a super-2 number, since 2×7987481² = 127599705450722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7987487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3993740 + 3993741.

It is an arithmetic number, because the mean of its divisors is an integer number (3993741).

Almost surely, 2^7987481 is an apocalyptic number.

It is an amenable number.

7987481 is a deficient number, since it is larger than the sum of its proper divisors (1).

7987481 is an equidigital number, since it uses as much as digits as its factorization.

7987481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 44.

The square root of 7987481 is about 2826.2131908262. The cubic root of 7987481 is about 199.8956205341.

The spelling of 7987481 in words is "seven million, nine hundred eighty-seven thousand, four hundred eighty-one".