47131657 has 4 divisors (see below), whose sum is σ = 47148820. Its totient is φ = 47114496.

The previous prime is 47131649. The next prime is 47131661. The reversal of 47131657 is 75613174.

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 16451136 + 30680521 = 4056^2 + 5539^2 .

It is a 3-Lehmer number, since φ(47131657) divides (47131657-1)³.

It is a cyclic number.

It is not a de Polignac number, because 47131657 - 2³ = 47131649 is a prime.

It is a deceptive number, since it divides R_47131656.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47131627) 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, 3432 + ... + 10297.

It is an arithmetic number, because the mean of its divisors is an integer number (11787205).

Almost surely, 2^47131657 is an apocalyptic number.

47131657 is the 3433-rd decagonal number.

It is an amenable number.

47131657 is a deficient number, since it is larger than the sum of its proper divisors (17163).

47131657 is a wasteful number, since it uses less digits than its factorization.

47131657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17162.

The product of its digits is 17640, while the sum is 34.

The square root of 47131657 is about 6865.2499590328. The cubic root of 47131657 is about 361.2192635176.

The spelling of 47131657 in words is "forty-seven million, one hundred thirty-one thousand, six hundred fifty-seven".