1375540685 has 8 divisors (see below), whose sum is σ = 1654327800. Its totient is φ = 1097979904.

The previous prime is 1375540643. The next prime is 1375540687. The reversal of 1375540685 is 5860455731.

It can be written as a sum of positive squares in 4 ways, for example, as 10903204 + 1364637481 = 3302^2 + 36941^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1375540685 is a prime.

It is a super-2 number, since 2×1375540685² = 3784224352180538450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1375540687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304112 + ... + 308601.

It is an arithmetic number, because the mean of its divisors is an integer number (206790975).

Almost surely, 2^1375540685 is an apocalyptic number.

It is an amenable number.

1375540685 is a deficient number, since it is larger than the sum of its proper divisors (278787115).

1375540685 is an equidigital number, since it uses as much as digits as its factorization.

1375540685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613167.

The product of its (nonzero) digits is 504000, while the sum is 44.

The square root of 1375540685 is about 37088.2823139600. The cubic root of 1375540685 is about 1112.1357804477.

The spelling of 1375540685 in words is "one billion, three hundred seventy-five million, five hundred forty thousand, six hundred eighty-five".