42616261 has 4 divisors (see below), whose sum is σ = 43655724. Its totient is φ = 41576800.

The previous prime is 42616253. The next prime is 42616291. The reversal of 42616261 is 16261624.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20196036 + 22420225 = 4494^2 + 4735^2 .

It is a cyclic number.

It is not a de Polignac number, because 42616261 - 2³ = 42616253 is a prime.

It is a super-2 number, since 2×42616261² = 3632291403240242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42616201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519670 + ... + 519751.

It is an arithmetic number, because the mean of its divisors is an integer number (10913931).

Almost surely, 2^42616261 is an apocalyptic number.

42616261 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42616261 is a deficient number, since it is larger than the sum of its proper divisors (1039463).

42616261 is a wasteful number, since it uses less digits than its factorization.

42616261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039462.

The product of its digits is 3456, while the sum is 28.

The square root of 42616261 is about 6528.1131270835. The cubic root of 42616261 is about 349.2945272783.

Adding to 42616261 its reverse (16261624), we get a palindrome (58877885).

The spelling of 42616261 in words is "forty-two million, six hundred sixteen thousand, two hundred sixty-one".