539139973 has 2 divisors, whose sum is σ = 539139974. Its totient is φ = 539139972.

The previous prime is 539139971. The next prime is 539140001. The reversal of 539139973 is 379931935.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 523402884 + 15737089 = 22878^2 + 3967^2 .

It is a cyclic number.

It is not a de Polignac number, because 539139973 - 2¹ = 539139971 is a prime.

Together with 539139971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (539139971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269569986 + 269569987.

It is an arithmetic number, because the mean of its divisors is an integer number (269569987).

Almost surely, 2^539139973 is an apocalyptic number.

It is an amenable number.

539139973 is a deficient number, since it is larger than the sum of its proper divisors (1).

539139973 is an equidigital number, since it uses as much as digits as its factorization.

539139973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 688905, while the sum is 49.

The square root of 539139973 is about 23219.3878687617. The cubic root of 539139973 is about 813.8927455592.

The spelling of 539139973 in words is "five hundred thirty-nine million, one hundred thirty-nine thousand, nine hundred seventy-three".