47651991 has 16 divisors (see below), whose sum is σ = 66493440. Its totient is φ = 30317760.

The previous prime is 47651983. The next prime is 47652061. The reversal of 47651991 is 19915674.

It is not a de Polignac number, because 47651991 - 2³ = 47651983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47651911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3280 + ... + 10298.

It is an arithmetic number, because the mean of its divisors is an integer number (4155840).

Almost surely, 2^47651991 is an apocalyptic number.

47651991 is a deficient number, since it is larger than the sum of its proper divisors (18841449).

47651991 is a wasteful number, since it uses less digits than its factorization.

47651991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7126.

The product of its digits is 68040, while the sum is 42.

The square root of 47651991 is about 6903.0421554558. The cubic root of 47651991 is about 362.5436897005.

The spelling of 47651991 in words is "forty-seven million, six hundred fifty-one thousand, nine hundred ninety-one".