542644393 has 2 divisors, whose sum is σ = 542644394. Its totient is φ = 542644392.

The previous prime is 542644387. The next prime is 542644447. The reversal of 542644393 is 393446245.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 427124889 + 115519504 = 20667^2 + 10748^2 .

It is a cyclic number.

It is not a de Polignac number, because 542644393 - 2¹³ = 542636201 is a prime.

It is equal to p_28479730 and since 542644393 and 28479730 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (542645393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271322196 + 271322197.

It is an arithmetic number, because the mean of its divisors is an integer number (271322197).

Almost surely, 2^542644393 is an apocalyptic number.

It is an amenable number.

542644393 is a deficient number, since it is larger than the sum of its proper divisors (1).

542644393 is an equidigital number, since it uses as much as digits as its factorization.

542644393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 40.

The square root of 542644393 is about 23294.7288672781. The cubic root of 542644393 is about 815.6523779030.

The spelling of 542644393 in words is "five hundred forty-two million, six hundred forty-four thousand, three hundred ninety-three".