42499121 has 12 divisors (see below), whose sum is σ = 49778100. Its totient is φ = 36177120.

The previous prime is 42499097. The next prime is 42499141. The reversal of 42499121 is 12199424.

It can be written as a sum of positive squares in 2 ways, for example, as 20830096 + 21669025 = 4564^2 + 4655^2 .

It is not a de Polignac number, because 42499121 - 2¹⁰ = 42498097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42499141) 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 11 ways as a sum of consecutive naturals, for example, 4391 + ... + 10211.

It is an arithmetic number, because the mean of its divisors is an integer number (4148175).

Almost surely, 2^42499121 is an apocalyptic number.

It is an amenable number.

42499121 is a deficient number, since it is larger than the sum of its proper divisors (7278979).

42499121 is a wasteful number, since it uses less digits than its factorization.

42499121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5984 (or 5977 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 42499121 is about 6519.1349886315. The cubic root of 42499121 is about 348.9741964431.

The spelling of 42499121 in words is "forty-two million, four hundred ninety-nine thousand, one hundred twenty-one".