40231531 has 16 divisors (see below), whose sum is σ = 45239040. Its totient is φ = 35592480.

The previous prime is 40231519. The next prime is 40231549. The reversal of 40231531 is 13513204.

It is a cyclic number.

It is not a de Polignac number, because 40231531 - 2¹⁹ = 39707243 is a prime.

It is a super-2 number, since 2×40231531² = 3237152173207922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40231499 and 40231508.

It is not an unprimeable number, because it can be changed into a prime (40231501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17721 + ... + 19861.

It is an arithmetic number, because the mean of its divisors is an integer number (2827440).

Almost surely, 2^40231531 is an apocalyptic number.

40231531 is a deficient number, since it is larger than the sum of its proper divisors (5007509).

40231531 is a wasteful number, since it uses less digits than its factorization.

40231531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 40231531 is about 6342.8330421035. The cubic root of 40231531 is about 342.6537743429.

Adding to 40231531 its reverse (13513204), we get a palindrome (53744735).

The spelling of 40231531 in words is "forty million, two hundred thirty-one thousand, five hundred thirty-one".