537979681 has 4 divisors (see below), whose sum is σ = 538887492. Its totient is φ = 537071872.

The previous prime is 537979669. The next prime is 537979691. The reversal of 537979681 is 186979735.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103632400 + 434347281 = 10180^2 + 20841^2 .

It is a cyclic number.

It is not a de Polignac number, because 537979681 - 2¹¹ = 537977633 is a prime.

It is a super-2 number, since 2×537979681² = 578844274337723522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (537979691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453016 + ... + 454201.

It is an arithmetic number, because the mean of its divisors is an integer number (134721873).

Almost surely, 2^537979681 is an apocalyptic number.

It is an amenable number.

537979681 is a deficient number, since it is larger than the sum of its proper divisors (907811).

537979681 is an equidigital number, since it uses as much as digits as its factorization.

537979681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907810.

The product of its digits is 2857680, while the sum is 55.

The square root of 537979681 is about 23194.3889982039. The cubic root of 537979681 is about 813.3084622236.

The spelling of 537979681 in words is "five hundred thirty-seven million, nine hundred seventy-nine thousand, six hundred eighty-one".