63491018 has 8 divisors (see below), whose sum is σ = 96126912. Its totient is φ = 31448716.

The previous prime is 63491011. The next prime is 63491023. The reversal of 63491018 is 81019436.

It is a happy number.

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

It is a super-2 number, since 2×63491018² = 8062218733352648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63491011) 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, 148130 + ... + 148557.

It is an arithmetic number, because the mean of its divisors is an integer number (12015864).

Almost surely, 2^63491018 is an apocalyptic number.

63491018 is a deficient number, since it is larger than the sum of its proper divisors (32635894).

63491018 is a wasteful number, since it uses less digits than its factorization.

63491018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296796.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 63491018 is about 7968.1251245196. The cubic root of 63491018 is about 398.9367973374.

The spelling of 63491018 in words is "sixty-three million, four hundred ninety-one thousand, eighteen".