63206991 has 6 divisors (see below), whose sum is σ = 91299000. Its totient is φ = 42137988.

The previous prime is 63206981. The next prime is 63207017. The reversal of 63206991 is 19960236.

It is not a de Polignac number, because 63206991 - 2⁵ = 63206959 is a prime.

It is a super-2 number, since 2×63206991² = 7990247422548162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63206951) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3511491 + ... + 3511508.

It is an arithmetic number, because the mean of its divisors is an integer number (15216500).

Almost surely, 2^63206991 is an apocalyptic number.

63206991 is a deficient number, since it is larger than the sum of its proper divisors (28092009).

63206991 is a wasteful number, since it uses less digits than its factorization.

63206991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7023005 (or 7023002 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 63206991 is about 7950.2824478128. The cubic root of 63206991 is about 398.3410269498.

The spelling of 63206991 in words is "sixty-three million, two hundred six thousand, nine hundred ninety-one".