1672671509 has 4 divisors (see below), whose sum is σ = 1674899520. Its totient is φ = 1670443500.

The previous prime is 1672671493. The next prime is 1672671521. The reversal of 1672671509 is 9051762761.

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 a cyclic number.

It is not a de Polignac number, because 1672671509 - 2⁴ = 1672671493 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 1672671509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1672671409) 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, 1112879 + ... + 1114380.

It is an arithmetic number, because the mean of its divisors is an integer number (418724880).

Almost surely, 2^1672671509 is an apocalyptic number.

It is an amenable number.

1672671509 is a deficient number, since it is larger than the sum of its proper divisors (2228011).

1672671509 is an equidigital number, since it uses as much as digits as its factorization.

1672671509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228010.

The product of its (nonzero) digits is 158760, while the sum is 44.

The square root of 1672671509 is about 40898.3069209472. The cubic root of 1672671509 is about 1187.0533004117.

The spelling of 1672671509 in words is "one billion, six hundred seventy-two million, six hundred seventy-one thousand, five hundred nine".