42081651 has 12 divisors (see below), whose sum is σ = 63427728. Its totient is φ = 26834544.

The previous prime is 42081619. The next prime is 42081659. The reversal of 42081651 is 15618024.

42081651 is a `hidden beast` number, since 4 + 2 + 0 + 8 + 1 + 651 = 666.

It is not a de Polignac number, because 42081651 - 2⁵ = 42081619 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (42081659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101440 + ... + 101853.

It is an arithmetic number, because the mean of its divisors is an integer number (5285644).

Almost surely, 2^42081651 is an apocalyptic number.

42081651 is a deficient number, since it is larger than the sum of its proper divisors (21346077).

42081651 is a wasteful number, since it uses less digits than its factorization.

42081651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203322 (or 203319 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 42081651 is about 6487.0371511191. The cubic root of 42081651 is about 347.8277734785.

Adding to 42081651 its reverse (15618024), we get a palindrome (57699675).

The spelling of 42081651 in words is "forty-two million, eighty-one thousand, six hundred fifty-one".