40047551 has 2 divisors, whose sum is σ = 40047552. Its totient is φ = 40047550.

The previous prime is 40047547. The next prime is 40047587. The reversal of 40047551 is 15574004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40047551 - 2² = 40047547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40047551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40047451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20023775 + 20023776.

It is an arithmetic number, because the mean of its divisors is an integer number (20023776).

Almost surely, 2^40047551 is an apocalyptic number.

40047551 is a deficient number, since it is larger than the sum of its proper divisors (1).

40047551 is an equidigital number, since it uses as much as digits as its factorization.

40047551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 40047551 is about 6328.3134404042. The cubic root of 40047551 is about 342.1306541142.

The spelling of 40047551 in words is "forty million, forty-seven thousand, five hundred fifty-one".