542120009 has 2 divisors, whose sum is σ = 542120010. Its totient is φ = 542120008.

The previous prime is 542119969. The next prime is 542120017. The reversal of 542120009 is 900021245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541725625 + 394384 = 23275^2 + 628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542120009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (542125009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271060004 + 271060005.

It is an arithmetic number, because the mean of its divisors is an integer number (271060005).

Almost surely, 2^542120009 is an apocalyptic number.

It is an amenable number.

542120009 is a deficient number, since it is larger than the sum of its proper divisors (1).

542120009 is an equidigital number, since it uses as much as digits as its factorization.

542120009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 542120009 is about 23283.4707249585. The cubic root of 542120009 is about 815.3895582062.

The spelling of 542120009 in words is "five hundred forty-two million, one hundred twenty thousand, nine".