42581129 has 2 divisors, whose sum is σ = 42581130. Its totient is φ = 42581128.

The previous prime is 42581093. The next prime is 42581153. The reversal of 42581129 is 92118524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38688400 + 3892729 = 6220^2 + 1973^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42581129 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42581095 and 42581104.

It is not a weakly prime, because it can be changed into another prime (42581179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21290564 + 21290565.

It is an arithmetic number, because the mean of its divisors is an integer number (21290565).

Almost surely, 2^42581129 is an apocalyptic number.

It is an amenable number.

42581129 is a deficient number, since it is larger than the sum of its proper divisors (1).

42581129 is an equidigital number, since it uses as much as digits as its factorization.

42581129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 32.

The square root of 42581129 is about 6525.4217488221. The cubic root of 42581129 is about 349.1985170645.

The spelling of 42581129 in words is "forty-two million, five hundred eighty-one thousand, one hundred twenty-nine".