542927681 has 2 divisors, whose sum is σ = 542927682. Its totient is φ = 542927680.

The previous prime is 542927639. The next prime is 542927711. The reversal of 542927681 is 186729245.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 518017600 + 24910081 = 22760^2 + 4991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542927681 is a prime.

It is a super-2 number, since 2×542927681² = 589540933592075522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (542921681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271463840 + 271463841.

It is an arithmetic number, because the mean of its divisors is an integer number (271463841).

Almost surely, 2^542927681 is an apocalyptic number.

It is an amenable number.

542927681 is a deficient number, since it is larger than the sum of its proper divisors (1).

542927681 is an equidigital number, since it uses as much as digits as its factorization.

542927681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 542927681 is about 23300.8085911198. The cubic root of 542927681 is about 815.7942905664.

The spelling of 542927681 in words is "five hundred forty-two million, nine hundred twenty-seven thousand, six hundred eighty-one".