40251551 has 4 divisors (see below), whose sum is σ = 40476600. Its totient is φ = 40026504.

The previous prime is 40251517. The next prime is 40251553. The reversal of 40251551 is 15515204.

It is a happy number.

40251551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40251551 - 2¹⁰ = 40250527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40251553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112256 + ... + 112613.

It is an arithmetic number, because the mean of its divisors is an integer number (10119150).

Almost surely, 2^40251551 is an apocalyptic number.

40251551 is a deficient number, since it is larger than the sum of its proper divisors (225049).

40251551 is a wasteful number, since it uses less digits than its factorization.

40251551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225048.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 40251551 is about 6344.4110049712. The cubic root of 40251551 is about 342.7106020004.

Adding to 40251551 its reverse (15515204), we get a palindrome (55766755).

The spelling of 40251551 in words is "forty million, two hundred fifty-one thousand, five hundred fifty-one".