542551681 has 8 divisors (see below), whose sum is σ = 620248320. Its totient is φ = 464902368.

The previous prime is 542551679. The next prime is 542551687. The reversal of 542551681 is 186155245.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 542551681 - 2¹ = 542551679 is a prime.

It is a super-2 number, since 2×542551681² = 588724653111851522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 542551681.

It is not an unprimeable number, because it can be changed into a prime (542551687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17640 + ... + 37366.

It is an arithmetic number, because the mean of its divisors is an integer number (77531040).

Almost surely, 2^542551681 is an apocalyptic number.

It is an amenable number.

542551681 is a deficient number, since it is larger than the sum of its proper divisors (77696639).

542551681 is a wasteful number, since it uses less digits than its factorization.

542551681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23663.

The product of its digits is 48000, while the sum is 37.

The square root of 542551681 is about 23292.7388041853. The cubic root of 542551681 is about 815.6059232504.

The spelling of 542551681 in words is "five hundred forty-two million, five hundred fifty-one thousand, six hundred eighty-one".