47131391 has 4 divisors (see below), whose sum is σ = 47175000. Its totient is φ = 47087784.

The previous prime is 47131387. The next prime is 47131411. The reversal of 47131391 is 19313174.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19313174 = 2 ⋅9656587.

It is a cyclic number.

It is not a de Polignac number, because 47131391 - 2² = 47131387 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 (47131691) 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, 20141 + ... + 22358.

It is an arithmetic number, because the mean of its divisors is an integer number (11793750).

Almost surely, 2^47131391 is an apocalyptic number.

47131391 is a deficient number, since it is larger than the sum of its proper divisors (43609).

47131391 is a wasteful number, since it uses less digits than its factorization.

47131391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43608.

The product of its digits is 2268, while the sum is 29.

The square root of 47131391 is about 6865.2305860765. The cubic root of 47131391 is about 361.2185839707.

The spelling of 47131391 in words is "forty-seven million, one hundred thirty-one thousand, three hundred ninety-one".