491409154 has 4 divisors (see below), whose sum is σ = 737113734. Its totient is φ = 245704576.

The previous prime is 491409133. The next prime is 491409161. The reversal of 491409154 is 451904194.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 480617929 + 10791225 = 21923^2 + 3285^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122852287 + ... + 122852290.

Almost surely, 2^491409154 is an apocalyptic number.

491409154 is a deficient number, since it is larger than the sum of its proper divisors (245704580).

491409154 is a wasteful number, since it uses less digits than its factorization.

491409154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245704579.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 491409154 is about 22167.7503143643. The cubic root of 491409154 is about 789.1285342944.

The spelling of 491409154 in words is "four hundred ninety-one million, four hundred nine thousand, one hundred fifty-four".