40121131 has 4 divisors (see below), whose sum is σ = 41865552. Its totient is φ = 38376712.

The previous prime is 40121129. The next prime is 40121149. The reversal of 40121131 is 13112104.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40121131 - 2¹ = 40121129 is a prime.

It is a super-2 number, since 2×40121131² = 3219410305438322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40121171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872176 + ... + 872221.

It is an arithmetic number, because the mean of its divisors is an integer number (10466388).

Almost surely, 2^40121131 is an apocalyptic number.

40121131 is a deficient number, since it is larger than the sum of its proper divisors (1744421).

40121131 is a wasteful number, since it uses less digits than its factorization.

40121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744420.

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

The square root of 40121131 is about 6334.1243277978. The cubic root of 40121131 is about 342.3400599422.

Adding to 40121131 its reverse (13112104), we get a palindrome (53233235).

The spelling of 40121131 in words is "forty million, one hundred twenty-one thousand, one hundred thirty-one".