1340865531 has 12 divisors (see below), whose sum is σ = 2050735752. Its totient is φ = 841327296.

The previous prime is 1340865527. The next prime is 1340865553. The reversal of 1340865531 is 1355680431.

1340865531 is a `hidden beast` number, since 1 + 3 + 40 + 86 + 5 + 531 = 666.

It is not a de Polignac number, because 1340865531 - 2² = 1340865527 is a prime.

It is a super-2 number, since 2×1340865531² = 3595840744447823922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1340860531) 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, 4381761 + ... + 4382066.

It is an arithmetic number, because the mean of its divisors is an integer number (170894646).

Almost surely, 2^1340865531 is an apocalyptic number.

1340865531 is a deficient number, since it is larger than the sum of its proper divisors (709870221).

1340865531 is a wasteful number, since it uses less digits than its factorization.

1340865531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8763850 (or 8763847 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1340865531 is about 36617.8307795533. The cubic root of 1340865531 is about 1102.7110898201.

The spelling of 1340865531 in words is "one billion, three hundred forty million, eight hundred sixty-five thousand, five hundred thirty-one".