40251251 has 4 divisors (see below), whose sum is σ = 40802712. Its totient is φ = 39699792.

The previous prime is 40251241. The next prime is 40251269. The reversal of 40251251 is 15215204.

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 40251251 - 2⁶ = 40251187 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 275621 + ... + 275766.

It is an arithmetic number, because the mean of its divisors is an integer number (10200678).

Almost surely, 2^40251251 is an apocalyptic number.

40251251 is a deficient number, since it is larger than the sum of its proper divisors (551461).

40251251 is an equidigital number, since it uses as much as digits as its factorization.

40251251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551460.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 40251251 is about 6344.3873620705. The cubic root of 40251251 is about 342.7097505762.

Adding to 40251251 its reverse (15215204), we get a palindrome (55466455).

The spelling of 40251251 in words is "forty million, two hundred fifty-one thousand, two hundred fifty-one".