47997155 has 4 divisors (see below), whose sum is σ = 57596592. Its totient is φ = 38397720.

The previous prime is 47997139. The next prime is 47997163. The reversal of 47997155 is 55179974.

47997155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 47997155 - 2⁴ = 47997139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4799711 + ... + 4799720.

It is an arithmetic number, because the mean of its divisors is an integer number (14399148).

Almost surely, 2^47997155 is an apocalyptic number.

47997155 is a deficient number, since it is larger than the sum of its proper divisors (9599437).

47997155 is an equidigital number, since it uses as much as digits as its factorization.

47997155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9599436.

The product of its digits is 396900, while the sum is 47.

The square root of 47997155 is about 6927.9979070436. The cubic root of 47997155 is about 363.4169382744.

The spelling of 47997155 in words is "forty-seven million, nine hundred ninety-seven thousand, one hundred fifty-five".