42987149 has 2 divisors, whose sum is σ = 42987150. Its totient is φ = 42987148.

The previous prime is 42987097. The next prime is 42987151. The reversal of 42987149 is 94178924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42159049 + 828100 = 6493^2 + 910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42987149 is a prime.

Together with 42987151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42987179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21493574 + 21493575.

It is an arithmetic number, because the mean of its divisors is an integer number (21493575).

Almost surely, 2^42987149 is an apocalyptic number.

It is an amenable number.

42987149 is a deficient number, since it is larger than the sum of its proper divisors (1).

42987149 is an equidigital number, since it uses as much as digits as its factorization.

42987149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 42987149 is about 6556.4585715156. The cubic root of 42987149 is about 350.3049016555.

It can be divided in two parts, 429 and 87149, that added together give a palindrome (87578).

The spelling of 42987149 in words is "forty-two million, nine hundred eighty-seven thousand, one hundred forty-nine".