1672105521 has 4 divisors (see below), whose sum is σ = 2229474032. Its totient is φ = 1114737012.

The previous prime is 1672105493. The next prime is 1672105531. The reversal of 1672105521 is 1255012761.

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.

It is not a de Polignac number, because 1672105521 - 2¹⁷ = 1671974449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1672105531) 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, 278684251 + ... + 278684256.

It is an arithmetic number, because the mean of its divisors is an integer number (557368508).

Almost surely, 2^1672105521 is an apocalyptic number.

It is an amenable number.

1672105521 is a deficient number, since it is larger than the sum of its proper divisors (557368511).

1672105521 is an equidigital number, since it uses as much as digits as its factorization.

1672105521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557368510.

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 1672105521 is about 40891.3868803688. The cubic root of 1672105521 is about 1186.9193961127.

The spelling of 1672105521 in words is "one billion, six hundred seventy-two million, one hundred five thousand, five hundred twenty-one".