47917155 has 64 divisors (see below), whose sum is σ = 91445760. Its totient is φ = 21120000.

The previous prime is 47917153. The next prime is 47917157. The reversal of 47917155 is 55171974.

47917155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

47917155 is a nontrivial binomial coefficient, being equal to C(9790, 2).

It is an interprime number because it is at equal distance from previous prime (47917153) and next prime (47917157).

It is not a de Polignac number, because 47917155 - 2¹ = 47917153 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (47917153) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 190780 + ... + 191030.

It is an arithmetic number, because the mean of its divisors is an integer number (1428840).

Almost surely, 2^47917155 is an apocalyptic number.

47917155 is the 9789-th triangular number and also the 4895-th hexagonal number.

47917155 is a deficient number, since it is larger than the sum of its proper divisors (43528605).

47917155 is a wasteful number, since it uses less digits than its factorization.

47917155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372.

The product of its digits is 44100, while the sum is 39.

The square root of 47917155 is about 6922.2218253968. The cubic root of 47917155 is about 363.2149157250.

The spelling of 47917155 in words is "forty-seven million, nine hundred seventeen thousand, one hundred fifty-five".