42120049 has 2 divisors, whose sum is σ = 42120050. Its totient is φ = 42120048.

The previous prime is 42120007. The next prime is 42120053. The reversal of 42120049 is 94002124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31719424 + 10400625 = 5632^2 + 3225^2 .

It is a cyclic number.

It is not a de Polignac number, because 42120049 - 2¹⁵ = 42087281 is a prime.

It is not a weakly prime, because it can be changed into another prime (42120649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21060024 + 21060025.

It is an arithmetic number, because the mean of its divisors is an integer number (21060025).

Almost surely, 2^42120049 is an apocalyptic number.

It is an amenable number.

42120049 is a deficient number, since it is larger than the sum of its proper divisors (1).

42120049 is an equidigital number, since it uses as much as digits as its factorization.

42120049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 42120049 is about 6489.9960708771. The cubic root of 42120049 is about 347.9335347808.

The spelling of 42120049 in words is "forty-two million, one hundred twenty thousand, forty-nine".