491961554 has 8 divisors (see below), whose sum is σ = 843362688. Its totient is φ = 210840660.

The previous prime is 491961553. The next prime is 491961563. The reversal of 491961554 is 455169194.

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

It is a super-2 number, since 2×491961554² = 484052341228189832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491961553) 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, 17570042 + ... + 17570069.

It is an arithmetic number, because the mean of its divisors is an integer number (105420336).

Almost surely, 2^491961554 is an apocalyptic number.

491961554 is a deficient number, since it is larger than the sum of its proper divisors (351401134).

491961554 is a wasteful number, since it uses less digits than its factorization.

491961554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35140120.

The product of its digits is 194400, while the sum is 44.

The square root of 491961554 is about 22180.2063561185. The cubic root of 491961554 is about 789.4241137598.

The spelling of 491961554 in words is "four hundred ninety-one million, nine hundred sixty-one thousand, five hundred fifty-four".