542507261 has 2 divisors, whose sum is σ = 542507262. Its totient is φ = 542507260.

The previous prime is 542507219. The next prime is 542507269. The reversal of 542507261 is 162705245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541446361 + 1060900 = 23269^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 542507261 - 2⁶ = 542507197 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542507269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271253630 + 271253631.

It is an arithmetic number, because the mean of its divisors is an integer number (271253631).

Almost surely, 2^542507261 is an apocalyptic number.

It is an amenable number.

542507261 is a deficient number, since it is larger than the sum of its proper divisors (1).

542507261 is an equidigital number, since it uses as much as digits as its factorization.

542507261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 542507261 is about 23291.7852686307. The cubic root of 542507261 is about 815.5836641089.

The spelling of 542507261 in words is "five hundred forty-two million, five hundred seven thousand, two hundred sixty-one".