40909551 has 4 divisors (see below), whose sum is σ = 54546072. Its totient is φ = 27273032.

The previous prime is 40909549. The next prime is 40909567. The reversal of 40909551 is 15590904.

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 40909551 - 2¹ = 40909549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40909501) 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, 6818256 + ... + 6818261.

It is an arithmetic number, because the mean of its divisors is an integer number (13636518).

Almost surely, 2^40909551 is an apocalyptic number.

40909551 is a deficient number, since it is larger than the sum of its proper divisors (13636521).

40909551 is a wasteful number, since it uses less digits than its factorization.

40909551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13636520.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 40909551 is about 6396.0574575280. The cubic root of 40909551 is about 344.5679700287.

The spelling of 40909551 in words is "forty million, nine hundred nine thousand, five hundred fifty-one".