42987517 has 2 divisors, whose sum is σ = 42987518. Its totient is φ = 42987516.

The previous prime is 42987499. The next prime is 42987521. The reversal of 42987517 is 71578924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41229241 + 1758276 = 6421^2 + 1326^2 .

It is a cyclic number.

It is not a de Polignac number, because 42987517 - 2⁷ = 42987389 is a prime.

It is a super-3 number, since 3×42987517³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42987547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21493758 + 21493759.

It is an arithmetic number, because the mean of its divisors is an integer number (21493759).

Almost surely, 2^42987517 is an apocalyptic number.

It is an amenable number.

42987517 is a deficient number, since it is larger than the sum of its proper divisors (1).

42987517 is an equidigital number, since it uses as much as digits as its factorization.

42987517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 43.

The square root of 42987517 is about 6556.4866353864. The cubic root of 42987517 is about 350.3059012708.

The spelling of 42987517 in words is "forty-two million, nine hundred eighty-seven thousand, five hundred seventeen".