671959154 has 8 divisors (see below), whose sum is σ = 1009090668. Its totient is φ = 335595600.

The previous prime is 671959091. The next prime is 671959177. The reversal of 671959154 is 451959176.

It can be written as a sum of positive squares in 2 ways, for example, as 661878529 + 10080625 = 25727^2 + 3175^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 671959099 and 671959108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189797 + ... + 193304.

Almost surely, 2^671959154 is an apocalyptic number.

671959154 is a deficient number, since it is larger than the sum of its proper divisors (337131514).

671959154 is a wasteful number, since it uses less digits than its factorization.

671959154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383980.

The product of its digits is 340200, while the sum is 47.

The square root of 671959154 is about 25922.1749473303. The cubic root of 671959154 is about 875.8860810070.

The spelling of 671959154 in words is "six hundred seventy-one million, nine hundred fifty-nine thousand, one hundred fifty-four".