491755690 has 8 divisors (see below), whose sum is σ = 885160260. Its totient is φ = 196702272.

The previous prime is 491755657. The next prime is 491755703. The reversal of 491755690 is 96557194.

It can be written as a sum of positive squares in 2 ways, for example, as 488454201 + 3301489 = 22101^2 + 1817^2 .

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

It is a super-2 number, since 2×491755690² = 483647317294752200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 491755690.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24587775 + ... + 24587794.

Almost surely, 2^491755690 is an apocalyptic number.

491755690 is a deficient number, since it is larger than the sum of its proper divisors (393404570).

491755690 is a wasteful number, since it uses less digits than its factorization.

491755690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49175576.

The product of its (nonzero) digits is 340200, while the sum is 46.

The square root of 491755690 is about 22175.5651562705. The cubic root of 491755690 is about 789.3139854527.

The spelling of 491755690 in words is "four hundred ninety-one million, seven hundred fifty-five thousand, six hundred ninety".