40113121 has 4 divisors (see below), whose sum is σ = 40130244. Its totient is φ = 40096000.

The previous prime is 40113053. The next prime is 40113131. The reversal of 40113121 is 12131104.

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 7623121 + 32490000 = 2761^2 + 5700^2 .

It is a cyclic number.

It is not a de Polignac number, because 40113121 - 2⁹ = 40112609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40113131) 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, 4360 + ... + 9961.

It is an arithmetic number, because the mean of its divisors is an integer number (10032561).

Almost surely, 2^40113121 is an apocalyptic number.

It is an amenable number.

40113121 is a deficient number, since it is larger than the sum of its proper divisors (17123).

40113121 is a wasteful number, since it uses less digits than its factorization.

40113121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17122.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 40113121 is about 6333.4920067843. The cubic root of 40113121 is about 342.3172762177.

Adding to 40113121 its reverse (12131104), we get a palindrome (52244225).

The spelling of 40113121 in words is "forty million, one hundred thirteen thousand, one hundred twenty-one".