40521431 has 4 divisors (see below), whose sum is σ = 40551600. Its totient is φ = 40491264.

The previous prime is 40521427. The next prime is 40521443. The reversal of 40521431 is 13412504.

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 40521431 - 2² = 40521427 is a prime.

It is a super-2 number, since 2×40521431² = 3283972740575522, 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 (40521631) 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, 12971 + ... + 15788.

It is an arithmetic number, because the mean of its divisors is an integer number (10137900).

Almost surely, 2^40521431 is an apocalyptic number.

40521431 is a deficient number, since it is larger than the sum of its proper divisors (30169).

40521431 is a wasteful number, since it uses less digits than its factorization.

40521431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30168.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 40521431 is about 6365.6445863714. The cubic root of 40521431 is about 343.4748358401.

Adding to 40521431 its reverse (13412504), we get a palindrome (53933935).

The spelling of 40521431 in words is "forty million, five hundred twenty-one thousand, four hundred thirty-one".