542981 has 2 divisors, whose sum is σ = 542982. Its totient is φ = 542980.

The previous prime is 542951. The next prime is 542987. The reversal of 542981 is 189245.

542981 is nontrivially palindromic in base 5.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 538756 + 4225 = 734^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 542981 - 2¹⁸ = 280837 is a prime.

It is a super-2 number, since 2×542981² = 589656732722, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271490 + 271491.

It is an arithmetic number, because the mean of its divisors is an integer number (271491).

2⁵⁴²⁹⁸¹ is an apocalyptic number.

It is an amenable number.

542981 is a deficient number, since it is larger than the sum of its proper divisors (1).

542981 is an equidigital number, since it uses as much as digits as its factorization.

542981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 542981 is about 736.8724448641. The cubic root of 542981 is about 81.5820995113.

The spelling of 542981 in words is "five hundred forty-two thousand, nine hundred eighty-one".