42261081 has 4 divisors (see below), whose sum is σ = 56348112. Its totient is φ = 28174052.

The previous prime is 42261077. The next prime is 42261083. The reversal of 42261081 is 18016224.

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 42261081 - 2² = 42261077 is a prime.

It is a super-2 number, since 2×42261081² = 3571997934577122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42261083) 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, 7043511 + ... + 7043516.

It is an arithmetic number, because the mean of its divisors is an integer number (14087028).

Almost surely, 2^42261081 is an apocalyptic number.

42261081 is the 4112-nd centered pentagonal number.

It is an amenable number.

42261081 is a deficient number, since it is larger than the sum of its proper divisors (14087031).

42261081 is a wasteful number, since it uses less digits than its factorization.

42261081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14087030.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 42261081 is about 6500.8523287335. The cubic root of 42261081 is about 348.3214347459.

The spelling of 42261081 in words is "forty-two million, two hundred sixty-one thousand, eighty-one".