491441557 has 8 divisors (see below), whose sum is σ = 496767800. Its totient is φ = 486143424.

The previous prime is 491441527. The next prime is 491441567. The reversal of 491441557 is 755144194.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 194017041 + 297424516 = 13929^2 + 17246^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 491441557 - 2¹⁵ = 491408789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491441507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29119 + ... + 42787.

It is an arithmetic number, because the mean of its divisors is an integer number (62095975).

Almost surely, 2^491441557 is an apocalyptic number.

It is an amenable number.

491441557 is a deficient number, since it is larger than the sum of its proper divisors (5326243).

491441557 is a wasteful number, since it uses less digits than its factorization.

491441557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14055.

The product of its digits is 100800, while the sum is 40.

The square root of 491441557 is about 22168.4811613245. The cubic root of 491441557 is about 789.1458786803.

The spelling of 491441557 in words is "four hundred ninety-one million, four hundred forty-one thousand, five hundred fifty-seven".