1671205523 has 4 divisors (see below), whose sum is σ = 1799759808. Its totient is φ = 1542651240.

The previous prime is 1671205513. The next prime is 1671205537. The reversal of 1671205523 is 3255021761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3255021761 = 5881 ⋅553481.

It is not a de Polignac number, because 1671205523 - 2²⁰ = 1670156947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1671205523.

It is not an unprimeable number, because it can be changed into a prime (1671205513) 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, 64277123 + ... + 64277148.

It is an arithmetic number, because the mean of its divisors is an integer number (449939952).

Almost surely, 2^1671205523 is an apocalyptic number.

1671205523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1671205523 is a deficient number, since it is larger than the sum of its proper divisors (128554285).

1671205523 is a wasteful number, since it uses less digits than its factorization.

1671205523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128554284.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 1671205523 is about 40880.3806611436. The cubic root of 1671205523 is about 1186.7064078013.

The spelling of 1671205523 in words is "one billion, six hundred seventy-one million, two hundred five thousand, five hundred twenty-three".