542523661 has 2 divisors, whose sum is σ = 542523662. Its totient is φ = 542523660.

The previous prime is 542523649. The next prime is 542523689. The reversal of 542523661 is 166325245.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 322920900 + 219602761 = 17970^2 + 14819^2 .

It is a cyclic number.

It is not a de Polignac number, because 542523661 - 2¹⁹ = 541999373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542523361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271261830 + 271261831.

It is an arithmetic number, because the mean of its divisors is an integer number (271261831).

Almost surely, 2^542523661 is an apocalyptic number.

It is an amenable number.

542523661 is a deficient number, since it is larger than the sum of its proper divisors (1).

542523661 is an equidigital number, since it uses as much as digits as its factorization.

542523661 is an evil number, because the sum of its binary digits is even.

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

The square root of 542523661 is about 23292.1373214224. The cubic root of 542523661 is about 815.5918823936.

The spelling of 542523661 in words is "five hundred forty-two million, five hundred twenty-three thousand, six hundred sixty-one".