40131431 has 4 divisors (see below), whose sum is σ = 40149000. Its totient is φ = 40113864.

The previous prime is 40131409. The next prime is 40131437. The reversal of 40131431 is 13413104.

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 40131431 - 2⁶ = 40131367 is a prime.

It is a super-2 number, since 2×40131431² = 3221063508215522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40131437) 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, 4736 + ... + 10133.

It is an arithmetic number, because the mean of its divisors is an integer number (10037250).

Almost surely, 2^40131431 is an apocalyptic number.

40131431 is a deficient number, since it is larger than the sum of its proper divisors (17569).

40131431 is a wasteful number, since it uses less digits than its factorization.

40131431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17568.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 40131431 is about 6334.9373319710. The cubic root of 40131431 is about 342.3693529094.

Adding to 40131431 its reverse (13413104), we get a palindrome (53544535).

The spelling of 40131431 in words is "forty million, one hundred thirty-one thousand, four hundred thirty-one".