47139577 has 4 divisors (see below), whose sum is σ = 47456100. Its totient is φ = 46823056.

The previous prime is 47139563. The next prime is 47139607. The reversal of 47139577 is 77593174.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77593174 = 2 ⋅38796587.

It can be written as a sum of positive squares in 2 ways, for example, as 29800681 + 17338896 = 5459^2 + 4164^2 .

It is a cyclic number.

It is not a de Polignac number, because 47139577 - 2¹¹ = 47137529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47139077) 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, 158038 + ... + 158335.

It is an arithmetic number, because the mean of its divisors is an integer number (11864025).

Almost surely, 2^47139577 is an apocalyptic number.

It is an amenable number.

47139577 is a deficient number, since it is larger than the sum of its proper divisors (316523).

47139577 is a wasteful number, since it uses less digits than its factorization.

47139577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316522.

The product of its digits is 185220, while the sum is 43.

The square root of 47139577 is about 6865.8267528390. The cubic root of 47139577 is about 361.2394954701.

The spelling of 47139577 in words is "forty-seven million, one hundred thirty-nine thousand, five hundred seventy-seven".