47991007 has 4 divisors (see below), whose sum is σ = 49539136. Its totient is φ = 46442880.

The previous prime is 47990993. The next prime is 47991011. The reversal of 47991007 is 70019974.

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

It is a cyclic number.

It is not a de Polignac number, because 47991007 - 2¹⁹ = 47466719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47991037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 774018 + ... + 774079.

It is an arithmetic number, because the mean of its divisors is an integer number (12384784).

Almost surely, 2^47991007 is an apocalyptic number.

47991007 is a deficient number, since it is larger than the sum of its proper divisors (1548129).

47991007 is a wasteful number, since it uses less digits than its factorization.

47991007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548128.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 47991007 is about 6927.5541860024. The cubic root of 47991007 is about 363.4014208079.

The spelling of 47991007 in words is "forty-seven million, nine hundred ninety-one thousand, seven".