1213512686 has 16 divisors (see below), whose sum is σ = 1855249920. Its totient is φ = 595203840.

The previous prime is 1213512667. The next prime is 1213512721. The reversal of 1213512686 is 6862153121.

It is a super-2 number, since 2×1213512686² = 2945226078165869192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4235 + ... + 49446.

It is an arithmetic number, because the mean of its divisors is an integer number (115953120).

Almost surely, 2^1213512686 is an apocalyptic number.

1213512686 is a deficient number, since it is larger than the sum of its proper divisors (641737234).

1213512686 is a wasteful number, since it uses less digits than its factorization.

1213512686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53899.

The product of its digits is 17280, while the sum is 35.

The square root of 1213512686 is about 34835.5089814976. The cubic root of 1213512686 is about 1066.6324047372.

The spelling of 1213512686 in words is "one billion, two hundred thirteen million, five hundred twelve thousand, six hundred eighty-six".