1206521636 has 12 divisors (see below), whose sum is σ = 2112160512. Its totient is φ = 603047208.

The previous prime is 1206521633. The next prime is 1206521639. The reversal of 1206521636 is 6361256021.

It is an interprime number because it is at equal distance from previous prime (1206521633) and next prime (1206521639).

It is a super-2 number, since 2×1206521636² = 2911388916272232992, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1206521633) 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, 40340 + ... + 63563.

It is an arithmetic number, because the mean of its divisors is an integer number (176013376).

Almost surely, 2^1206521636 is an apocalyptic number.

It is an amenable number.

1206521636 is a deficient number, since it is larger than the sum of its proper divisors (905638876).

1206521636 is a wasteful number, since it uses less digits than its factorization.

1206521636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106810 (or 106808 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1206521636 is about 34735.0203109196. The cubic root of 1206521636 is about 1064.5801679345.

Adding to 1206521636 its reverse (6361256021), we get a palindrome (7567777657).

The spelling of 1206521636 in words is "one billion, two hundred six million, five hundred twenty-one thousand, six hundred thirty-six".