40515231 has 4 divisors (see below), whose sum is σ = 54020312. Its totient is φ = 27010152.

The previous prime is 40515193. The next prime is 40515247. The reversal of 40515231 is 13251504.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 40515231 - 2⁷ = 40515103 is a prime.

It is a super-2 number, since 2×40515231² = 3282967885966722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40515198 and 40515207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40515271) 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, 6752536 + ... + 6752541.

It is an arithmetic number, because the mean of its divisors is an integer number (13505078).

Almost surely, 2^40515231 is an apocalyptic number.

40515231 is a deficient number, since it is larger than the sum of its proper divisors (13505081).

40515231 is a wasteful number, since it uses less digits than its factorization.

40515231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13505080.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 40515231 is about 6365.1575785679. The cubic root of 40515231 is about 343.4573171054.

Adding to 40515231 its reverse (13251504), we get a palindrome (53766735).

The spelling of 40515231 in words is "forty million, five hundred fifteen thousand, two hundred thirty-one".