542796781 has 2 divisors, whose sum is σ = 542796782. Its totient is φ = 542796780.

The previous prime is 542796739. The next prime is 542796811. The reversal of 542796781 is 187697245.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 495062500 + 47734281 = 22250^2 + 6909^2 .

It is a cyclic number.

It is not a de Polignac number, because 542796781 - 2⁹ = 542796269 is a prime.

It is a super-2 number, since 2×542796781² = 589256690927923922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542716781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271398390 + 271398391.

It is an arithmetic number, because the mean of its divisors is an integer number (271398391).

Almost surely, 2^542796781 is an apocalyptic number.

It is an amenable number.

542796781 is a deficient number, since it is larger than the sum of its proper divisors (1).

542796781 is an equidigital number, since it uses as much as digits as its factorization.

542796781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 49.

The square root of 542796781 is about 23297.9995063954. Note that the first 3 decimals coincide. The cubic root of 542796781 is about 815.7287225607.

The spelling of 542796781 in words is "five hundred forty-two million, seven hundred ninety-six thousand, seven hundred eighty-one".