542809961 has 2 divisors, whose sum is σ = 542809962. Its totient is φ = 542809960.

The previous prime is 542809933. The next prime is 542809973. The reversal of 542809961 is 169908245.

542809961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 336025561 + 206784400 = 18331^2 + 14380^2 .

It is a cyclic number.

It is not a de Polignac number, because 542809961 - 2²² = 538615657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (542809901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271404980 + 271404981.

It is an arithmetic number, because the mean of its divisors is an integer number (271404981).

Almost surely, 2^542809961 is an apocalyptic number.

It is an amenable number.

542809961 is a deficient number, since it is larger than the sum of its proper divisors (1).

542809961 is an equidigital number, since it uses as much as digits as its factorization.

542809961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 542809961 is about 23298.2823615819. The cubic root of 542809961 is about 815.7353249196.

The spelling of 542809961 in words is "five hundred forty-two million, eight hundred nine thousand, nine hundred sixty-one".