542253661 has 2 divisors, whose sum is σ = 542253662. Its totient is φ = 542253660.

The previous prime is 542253631. The next prime is 542253667. The reversal of 542253661 is 166352245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 440748036 + 101505625 = 20994^2 + 10075^2 .

It is a cyclic number.

It is not a de Polignac number, because 542253661 - 2²⁵ = 508699229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542253667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271126830 + 271126831.

It is an arithmetic number, because the mean of its divisors is an integer number (271126831).

Almost surely, 2^542253661 is an apocalyptic number.

It is an amenable number.

542253661 is a deficient number, since it is larger than the sum of its proper divisors (1).

542253661 is an equidigital number, since it uses as much as digits as its factorization.

542253661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 34.

The square root of 542253661 is about 23286.3406528377. The cubic root of 542253661 is about 815.4565602776.

The spelling of 542253661 in words is "five hundred forty-two million, two hundred fifty-three thousand, six hundred sixty-one".