40391051 has 4 divisors (see below), whose sum is σ = 40499712. Its totient is φ = 40282392.

The previous prime is 40391003. The next prime is 40391053. The reversal of 40391051 is 15019304.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40391051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40391053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53771 + ... + 54516.

It is an arithmetic number, because the mean of its divisors is an integer number (10124928).

Almost surely, 2^40391051 is an apocalyptic number.

40391051 is a deficient number, since it is larger than the sum of its proper divisors (108661).

40391051 is a wasteful number, since it uses less digits than its factorization.

40391051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108660.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 40391051 is about 6355.3954243619. The cubic root of 40391051 is about 343.1060567864.

The spelling of 40391051 in words is "forty million, three hundred ninety-one thousand, fifty-one".