42661091 has 12 divisors (see below), whose sum is σ = 47101152. Its totient is φ = 38610000.

The previous prime is 42661079. The next prime is 42661103. The reversal of 42661091 is 19016624.

It is an interprime number because it is at equal distance from previous prime (42661079) and next prime (42661103).

It is not a de Polignac number, because 42661091 - 2¹⁸ = 42398947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42661391) 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, 32141 + ... + 33441.

It is an arithmetic number, because the mean of its divisors is an integer number (3925096).

Almost surely, 2^42661091 is an apocalyptic number.

42661091 is a deficient number, since it is larger than the sum of its proper divisors (4440061).

42661091 is a wasteful number, since it uses less digits than its factorization.

42661091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594 (or 1583 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 42661091 is about 6531.5458354053. The cubic root of 42661091 is about 349.4169640018.

The spelling of 42661091 in words is "forty-two million, six hundred sixty-one thousand, ninety-one".