42490161 has 24 divisors (see below), whose sum is σ = 71111040. Its totient is φ = 23944896.

The previous prime is 42490141. The next prime is 42490183. The reversal of 42490161 is 16109424.

It is not a de Polignac number, because 42490161 - 2¹³ = 42481969 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42490111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21 + ... + 9218.

It is an arithmetic number, because the mean of its divisors is an integer number (2962960).

Almost surely, 2^42490161 is an apocalyptic number.

It is an amenable number.

42490161 is a deficient number, since it is larger than the sum of its proper divisors (28620879).

42490161 is a wasteful number, since it uses less digits than its factorization.

42490161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9325 (or 9322 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 42490161 is about 6518.4477446705. The cubic root of 42490161 is about 348.9496702216.

Adding to 42490161 its reverse (16109424), we get a palindrome (58599585).

The spelling of 42490161 in words is "forty-two million, four hundred ninety thousand, one hundred sixty-one".