1672618491 has 20 divisors (see below), whose sum is σ = 2645581752. Its totient is φ = 1049485248.

The previous prime is 1672618463. The next prime is 1672618501. The reversal of 1672618491 is 1948162761.

It is not a de Polignac number, because 1672618491 - 2⁶ = 1672618427 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1672618421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 605965 + ... + 608718.

Almost surely, 2^1672618491 is an apocalyptic number.

1672618491 is a deficient number, since it is larger than the sum of its proper divisors (972963261).

1672618491 is a wasteful number, since it uses less digits than its factorization.

1672618491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214712 (or 1214703 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 1672618491 is about 40897.6587471704. The cubic root of 1672618491 is about 1187.0407584279.

The spelling of 1672618491 in words is "one billion, six hundred seventy-two million, six hundred eighteen thousand, four hundred ninety-one".