42520129 has 2 divisors, whose sum is σ = 42520130. Its totient is φ = 42520128.

The previous prime is 42520117. The next prime is 42520133. The reversal of 42520129 is 92102524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41473600 + 1046529 = 6440^2 + 1023^2 .

It is a cyclic number.

It is not a de Polignac number, because 42520129 - 2⁵ = 42520097 is a prime.

It is a super-2 number, since 2×42520129² = 3615922740353282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42520139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21260064 + 21260065.

It is an arithmetic number, because the mean of its divisors is an integer number (21260065).

Almost surely, 2^42520129 is an apocalyptic number.

It is an amenable number.

42520129 is a deficient number, since it is larger than the sum of its proper divisors (1).

42520129 is an equidigital number, since it uses as much as digits as its factorization.

42520129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 42520129 is about 6520.7460462742. The cubic root of 42520129 is about 349.0316881597.

The spelling of 42520129 in words is "forty-two million, five hundred twenty thousand, one hundred twenty-nine".