12171477 has 4 divisors (see below), whose sum is σ = 16228640. Its totient is φ = 8114316.

The previous prime is 12171469. The next prime is 12171487. The reversal of 12171477 is 77417121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77417121 = 3 ⋅25805707.

It is not a de Polignac number, because 12171477 - 2³ = 12171469 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 (12171427) 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, 2028577 + ... + 2028582.

It is an arithmetic number, because the mean of its divisors is an integer number (4057160).

Almost surely, 2^12171477 is an apocalyptic number.

It is an amenable number.

12171477 is a deficient number, since it is larger than the sum of its proper divisors (4057163).

12171477 is an equidigital number, since it uses as much as digits as its factorization.

12171477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4057162.

The product of its digits is 2744, while the sum is 30.

The square root of 12171477 is about 3488.7643944526. The cubic root of 12171477 is about 230.0282070006.

Adding to 12171477 its reverse (77417121), we get a palindrome (89588598).

The spelling of 12171477 in words is "twelve million, one hundred seventy-one thousand, four hundred seventy-seven".