42081554 has 4 divisors (see below), whose sum is σ = 63122334. Its totient is φ = 21040776.

The previous prime is 42081541. The next prime is 42081569. The reversal of 42081554 is 45518024.

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

It can be written as a sum of positive squares in only one way, i.e., 25230529 + 16851025 = 5023^2 + 4105^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520387 + ... + 10520390.

Almost surely, 2^42081554 is an apocalyptic number.

42081554 is a deficient number, since it is larger than the sum of its proper divisors (21040780).

42081554 is a wasteful number, since it uses less digits than its factorization.

42081554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21040779.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 42081554 is about 6487.0296746662. The cubic root of 42081554 is about 347.8275062256.

Adding to 42081554 its reverse (45518024), we get a palindrome (87599578).

The spelling of 42081554 in words is "forty-two million, eighty-one thousand, five hundred fifty-four".