1213512687 has 12 divisors (see below), whose sum is σ = 1753287120. Its totient is φ = 808807488.

The previous prime is 1213512667. The next prime is 1213512721. The reversal of 1213512687 is 7862153121.

It is not a de Polignac number, because 1213512687 - 2⁸ = 1213512431 is a prime.

It is a super-2 number, since 2×1213512687² = 2945226083019919938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213512607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27703 + ... + 56519.

It is an arithmetic number, because the mean of its divisors is an integer number (146107260).

Almost surely, 2^1213512687 is an apocalyptic number.

1213512687 is a deficient number, since it is larger than the sum of its proper divisors (539774433).

1213512687 is a wasteful number, since it uses less digits than its factorization.

1213512687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33502 (or 33499 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 1213512687 is about 34835.5089958508. The cubic root of 1213512687 is about 1066.6324050302.

The spelling of 1213512687 in words is "one billion, two hundred thirteen million, five hundred twelve thousand, six hundred eighty-seven".