542121989 has 2 divisors, whose sum is σ = 542121990. Its totient is φ = 542121988.

The previous prime is 542121953. The next prime is 542121997. The reversal of 542121989 is 989121245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 515517025 + 26604964 = 22705^2 + 5158^2 .

It is a cyclic number.

It is not a de Polignac number, because 542121989 - 2²⁸ = 273686533 is a prime.

It is a super-2 number, since 2×542121989² = 587792501914632242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542121949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271060994 + 271060995.

It is an arithmetic number, because the mean of its divisors is an integer number (271060995).

Almost surely, 2^542121989 is an apocalyptic number.

It is an amenable number.

542121989 is a deficient number, since it is larger than the sum of its proper divisors (1).

542121989 is an equidigital number, since it uses as much as digits as its factorization.

542121989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 542121989 is about 23283.5132443538. The cubic root of 542121989 is about 815.3905508949.

The spelling of 542121989 in words is "five hundred forty-two million, one hundred twenty-one thousand, nine hundred eighty-nine".