40251231 has 6 divisors (see below), whose sum is σ = 58140680. Its totient is φ = 26834148.

The previous prime is 40251209. The next prime is 40251241. The reversal of 40251231 is 13215204.

It is not a de Polignac number, because 40251231 - 2⁷ = 40251103 is a prime.

It is a super-2 number, since 2×40251231² = 3240323194030722, 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 (40251241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2236171 + ... + 2236188.

Almost surely, 2^40251231 is an apocalyptic number.

40251231 is a deficient number, since it is larger than the sum of its proper divisors (17889449).

40251231 is a wasteful number, since it uses less digits than its factorization.

40251231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4472365 (or 4472362 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 40251231 is about 6344.3857858740. The cubic root of 40251231 is about 342.7096938145.

Adding to 40251231 its reverse (13215204), we get a palindrome (53466435).

The spelling of 40251231 in words is "forty million, two hundred fifty-one thousand, two hundred thirty-one".