47742509 has 2 divisors, whose sum is σ = 47742510. Its totient is φ = 47742508.

The previous prime is 47742481. The next prime is 47742521. The reversal of 47742509 is 90524774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28408900 + 19333609 = 5330^2 + 4397^2 .

It is a cyclic number.

It is not a de Polignac number, because 47742509 - 2¹² = 47738413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47742529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23871254 + 23871255.

It is an arithmetic number, because the mean of its divisors is an integer number (23871255).

Almost surely, 2^47742509 is an apocalyptic number.

It is an amenable number.

47742509 is a deficient number, since it is larger than the sum of its proper divisors (1).

47742509 is an equidigital number, since it uses as much as digits as its factorization.

47742509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 47742509 is about 6909.5954295458. The cubic root of 47742509 is about 362.7731027971.

The spelling of 47742509 in words is "forty-seven million, seven hundred forty-two thousand, five hundred nine".