538456681 has 4 divisors (see below), whose sum is σ = 615379072. Its totient is φ = 461534292.

The previous prime is 538456679. The next prime is 538456697. The reversal of 538456681 is 186654835.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 538456681 - 2¹ = 538456679 is a prime.

It is a super-2 number, since 2×538456681² = 579871194627071522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (538456661) 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, 38461185 + ... + 38461198.

It is an arithmetic number, because the mean of its divisors is an integer number (153844768).

Almost surely, 2^538456681 is an apocalyptic number.

It is an amenable number.

538456681 is a deficient number, since it is larger than the sum of its proper divisors (76922391).

538456681 is an equidigital number, since it uses as much as digits as its factorization.

538456681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76922390.

The product of its digits is 691200, while the sum is 46.

The square root of 538456681 is about 23204.6693792435. The cubic root of 538456681 is about 813.5487646913.

The spelling of 538456681 in words is "five hundred thirty-eight million, four hundred fifty-six thousand, six hundred eighty-one".