40515551 has 4 divisors (see below), whose sum is σ = 41377632. Its totient is φ = 39653472.

The previous prime is 40515533. The next prime is 40515569. The reversal of 40515551 is 15551504.

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

It is an interprime number because it is at equal distance from previous prime (40515533) and next prime (40515569).

It is a cyclic number.

It is not a de Polignac number, because 40515551 - 2⁶ = 40515487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40515551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40515521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 430970 + ... + 431063.

It is an arithmetic number, because the mean of its divisors is an integer number (10344408).

Almost surely, 2^40515551 is an apocalyptic number.

40515551 is a deficient number, since it is larger than the sum of its proper divisors (862081).

40515551 is an equidigital number, since it uses as much as digits as its factorization.

40515551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862080.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 40515551 is about 6365.1827153665. The cubic root of 40515551 is about 343.4582213419.

The spelling of 40515551 in words is "forty million, five hundred fifteen thousand, five hundred fifty-one".