40531291 has 4 divisors (see below), whose sum is σ = 41838784. Its totient is φ = 39223800.

The previous prime is 40531259. The next prime is 40531319. The reversal of 40531291 is 19213504.

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 40531291 - 2⁵ = 40531259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40531691) 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, 653700 + ... + 653761.

It is an arithmetic number, because the mean of its divisors is an integer number (10459696).

Almost surely, 2^40531291 is an apocalyptic number.

40531291 is a deficient number, since it is larger than the sum of its proper divisors (1307493).

40531291 is a wasteful number, since it uses less digits than its factorization.

40531291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307492.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 40531291 is about 6366.4190091448. The cubic root of 40531291 is about 343.5026925992.

Adding to 40531291 its reverse (19213504), we get a palindrome (59744795).

The spelling of 40531291 in words is "forty million, five hundred thirty-one thousand, two hundred ninety-one".