542238989 has 2 divisors, whose sum is σ = 542238990. Its totient is φ = 542238988.

The previous prime is 542238979. The next prime is 542239067. The reversal of 542238989 is 989832245.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 500416900 + 41822089 = 22370^2 + 6467^2 .

It is a cyclic number.

It is not a de Polignac number, because 542238989 - 2¹² = 542234893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542238979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271119494 + 271119495.

It is an arithmetic number, because the mean of its divisors is an integer number (271119495).

Almost surely, 2^542238989 is an apocalyptic number.

It is an amenable number.

542238989 is a deficient number, since it is larger than the sum of its proper divisors (1).

542238989 is an equidigital number, since it uses as much as digits as its factorization.

542238989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 50.

The square root of 542238989 is about 23286.0256162360. The cubic root of 542238989 is about 815.4492054869.

The spelling of 542238989 in words is "five hundred forty-two million, two hundred thirty-eight thousand, nine hundred eighty-nine".