40121553 has 4 divisors (see below), whose sum is σ = 53495408. Its totient is φ = 26747700.

The previous prime is 40121551. The next prime is 40121561. The reversal of 40121553 is 35512104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 40121553 - 2¹ = 40121551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40121551) 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, 6686923 + ... + 6686928.

It is an arithmetic number, because the mean of its divisors is an integer number (13373852).

Almost surely, 2^40121553 is an apocalyptic number.

It is an amenable number.

40121553 is a deficient number, since it is larger than the sum of its proper divisors (13373855).

40121553 is a wasteful number, since it uses less digits than its factorization.

40121553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13373854.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 40121553 is about 6334.1576393393. The cubic root of 40121553 is about 342.3412601992.

Adding to 40121553 its reverse (35512104), we get a palindrome (75633657).

It can be divided in two parts, 4012 and 1553, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 40121553 in words is "forty million, one hundred twenty-one thousand, five hundred fifty-three".