1361391687 has 24 divisors (see below), whose sum is σ = 1978466256. Its totient is φ = 902071296.

The previous prime is 1361391683. The next prime is 1361391697. The reversal of 1361391687 is 7861931631.

1361391687 is a `hidden beast` number, since 13 + 613 + 9 + 16 + 8 + 7 = 666.

It is not a de Polignac number, because 1361391687 - 2² = 1361391683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361391683) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1645768 + ... + 1646594.

It is an arithmetic number, because the mean of its divisors is an integer number (82436094).

Almost surely, 2^1361391687 is an apocalyptic number.

1361391687 is a deficient number, since it is larger than the sum of its proper divisors (617074569).

1361391687 is a wasteful number, since it uses less digits than its factorization.

1361391687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1727 (or 1724 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 1361391687 is about 36897.0417106846. The cubic root of 1361391687 is about 1108.3094377321.

The spelling of 1361391687 in words is "one billion, three hundred sixty-one million, three hundred ninety-one thousand, six hundred eighty-seven".