40205131 has 4 divisors (see below), whose sum is σ = 40219200. Its totient is φ = 40191064.

The previous prime is 40205101. The next prime is 40205141. The reversal of 40205131 is 13150204.

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 40205131 - 2⁷ = 40205003 is a prime.

It is a super-2 number, since 2×40205131² = 3232905117454322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40205101) 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, 1051 + ... + 9028.

It is an arithmetic number, because the mean of its divisors is an integer number (10054800).

Almost surely, 2^40205131 is an apocalyptic number.

40205131 is a deficient number, since it is larger than the sum of its proper divisors (14069).

40205131 is a wasteful number, since it uses less digits than its factorization.

40205131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14068.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 40205131 is about 6340.7516115994. The cubic root of 40205131 is about 342.5788079437.

Adding to 40205131 its reverse (13150204), we get a palindrome (53355335).

The spelling of 40205131 in words is "forty million, two hundred five thousand, one hundred thirty-one".