542809973 has 2 divisors, whose sum is σ = 542809974. Its totient is φ = 542809972.

The previous prime is 542809961. The next prime is 542809997. The reversal of 542809973 is 379908245.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 342361009 + 200448964 = 18503^2 + 14158^2 .

It is a cyclic number.

It is not a de Polignac number, because 542809973 - 2¹⁰ = 542808949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542809933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271404986 + 271404987.

It is an arithmetic number, because the mean of its divisors is an integer number (271404987).

Almost surely, 2^542809973 is an apocalyptic number.

It is an amenable number.

542809973 is a deficient number, since it is larger than the sum of its proper divisors (1).

542809973 is an equidigital number, since it uses as much as digits as its factorization.

542809973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 542809973 is about 23298.2826191116. The cubic root of 542809973 is about 815.7353309308.

The spelling of 542809973 in words is "five hundred forty-two million, eight hundred nine thousand, nine hundred seventy-three".