47031989 has 4 divisors (see below), whose sum is σ = 47058924. Its totient is φ = 47005056.

The previous prime is 47031983. The next prime is 47032039. The reversal of 47031989 is 98913074.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19731364 + 27300625 = 4442^2 + 5225^2 .

It is a cyclic number.

It is not a de Polignac number, because 47031989 - 2²⁴ = 30254773 is a prime.

It is a super-2 number, since 2×47031989² = 4424015978592242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47031983) 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, 10652 + ... + 14405.

It is an arithmetic number, because the mean of its divisors is an integer number (11764731).

Almost surely, 2^47031989 is an apocalyptic number.

It is an amenable number.

47031989 is a deficient number, since it is larger than the sum of its proper divisors (26935).

47031989 is a wasteful number, since it uses less digits than its factorization.

47031989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26934.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 47031989 is about 6857.9872411663. The cubic root of 47031989 is about 360.9644637278.

The spelling of 47031989 in words is "forty-seven million, thirty-one thousand, nine hundred eighty-nine".